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Correção páginas 59,60 1) Calcule: a) f(-1) e f(1/2) sendo f(-1) = -(-1)² +2.(-1) = -1-2=-3 f(1/2) = - (1/2)²+2.(1/2) = -1/4+1 = 3/4 g(0), g(2) e sendo g(0) = g(2) = sendo e = = = sendo e = = 2) Sendo f(x) = 3, f(x) = 2x+1 e f(x) = -2x+3 e f(x) = x2 calcule se existir, em cada um dos casos, f´(0), utilizando a definição de derivada. �� EMBED Equation.3 3) Sendo f(x) = x2 + 1, calcule f´(1) utilizando a definição de derivada, encontre a equação da reta tangente ao gráfico de f(x) no ponto (1,2), e interprete geometricamente. O coeficiente da reta tangente é dada pela derivada no ponto: Logo a = f’(1) = 2. E a equação é dada por y-y0 = a(x-x0) ( y-2 = 2(x-1)( y-2 = 2x-2( y = 2x 4) Encontre a taxa média de variação de cada função abaixo: f(x) = 4-2x com x0+h = 5 e x0 = 1 f(x) = -5x+7 com x0+h = 4 e x0 = 3 f(x) = 3x2+x com x0+h = 7 e x0 = 4 f(x)= 3x+5 com x0+h = -1 e x0 = -2 f(x)= 2x2-3x+1 com x0+h= 3 e x0 =-2 f(x) =12- x com x0+h= 0 e x0 = -1 f(x) = 2x2 +4x com x0+h = 4 e x0 = 0 f(x) = 3-6x com x0+h= 6 e x0 = 5 5) Calcule a derivada das seguintes funções: f(x) = 1 ( f’(x) = 0 f(x) = x-2 ( f’(x) = 1 f(x) = -x +1 ( f’(x) = -1 f(x) =3x+12 ( f’(x) = 3 f(x) = x3-4x ( f’(x) = 3x²-4 f(x)= =x-2 ( f’(x) = -2x-3 =- f(x) = =x1/2 ( f’(x) = ½ x-1/2 = f(x) = (f’(x) = f(x) = 3x2+5x4+2x6 ( f’(x) = 6x+20x³+12x5 f(x) = 2-x10 ( f’(x) = -10x9 f(x) = 0,1.x10 +0,2x5 ( f’(x) = 1x9+1x4 f(x) = x2+5x-9 ( f’(x) =2x+5 f(x) = (2x+4).ex ( f’(x) = 2ex+(2x+4).ex f(x) = =x-1 ( f’(x) = -1x-2 =- f(x)= =x1/3 ( f’(x) = 1/3 x-2/3 = p)f(x) = ( f ’(x) = = = 6) Calcule a derivada das funções nos pontos indicados: f(x) = x2+1, no ponto x =3 f’(x) = 2x( f’(3) = 2.3 = 6 f(x) = 9x3-x, no ponto x = 1 f’(x) = 27x² -1 ( f’(1) = 27.1²-1 = 27-1 = 26 f(x) = -3x4+5x2, no ponto x = -2 f’(x) = -12x³ +10x ( f’(-2) = -12(-2)³ +10(-2) = 96-20 =76 f(x) = -x7, no ponto x = 1 f’(x) = -7x6( f’(1) = -7.16 = -7 f(x) = =x-1 no ponto x = 2 f’(x) = -1x-2 =- ( f’(2) = - f(x) = (x5+2x3+5x).(2-x2-x4) no ponto x = 0 f’(x) = (5x4+6x2+5).(2-x2-x4)+ (x5+2x3+5x).(-2x-4x3) f’(0) = (5.04+6.02+5).(2-.02-04)+ (05+2.03+5.0).(-2.0-4.03) =5.2 = 10 f(x)= =x-2 no ponto x=3 f’(x) = -2x-3 =- ( f’(3) = - 7) Calcule a derivada das seguintes funções simples: a) y = -3 ( y’=0 b) y = -x3 (y’=-3x2 c) y = 6x2 ( y’=12x d) y = ( y’= e) y = 5x – 3x2 +4 (f’(x)=5-6x f) y = 7-x (y’ =-1 g) y = (y’= h) y = 6x 0,5 ( y’ = 3x-0,5 i) y = =x1/5+x1/3 (y’= = j) y = 5. ex+ 6. ln(x) +3. 2x + 6 (y’=5.ex + 6. +3.2x.ln2 k) y = 12x + x3 ( y’=12x.ln12+3x2 l) y = 0 ( y’=0 m) y = 3-x6+x8 ( y’=-6x5+8x5 n) y = 4x+5x2+6x3+7x4 (y’=4+10x+18x2+28x3 o) y = ( y’ = 3/4 p) y = 0,2x+0,5x2-0,3 ( y’=0,2+x q) y = -0,6x ( y’ = -0,6 r) y = (y’= s) y = 7.ex + ln(x) - ln 2 (y’=7ex+1/x t) y = -3x+5= x1/5-3x+5 (y’= -3 = u) y = 10x + 5. ln(x) + 3x+4 ( y’=10x.ln10+5.1/x+3 v) y =5.3x ( y’ = 5.3x.ln3 Correção das Páginas 68 a 71 7) Sendo a, b, c e C constantes, ache as derivadas das seguintes funções: (constante, linear, constante vezes uma função, soma e diferença, potência e polinômios) � (y’=0 ( y’ = 3 ( y’ = 5 ( y’ = 12x11 ( y’ = -12x-13 ( y’ = 4/3 x1/3 ( y’ = 24t² ( y’ = 12t³ -4t = x-4 ( f’(x) = -4x-5 =- ( f’(q) = 3q² (f’(x) = C.2x = 2Cx ( y’=2x+5 ( y’ = 18x²+8x-2 ( y’ = -12x³-12x²-6 ( y’ = 8,4q -0,5 ( y’ = 2ax+b =z²+ ( y’ = 2z- z-2 = 2z- = 3t² +12t-1/2 –t -2 ( y’ = 6t -6t-3/2 +2t-3 = = 3t² -5t1/2 +7t-1 ( y’ = 6t -5/2t-1/2-7t-2 = 8) Seja . Calcule as derivadas f’(0), f’(1), f’(2) e f’(-1). Verifique suas respostas graficamente. F’(x) =2x ( f’(0) = 2.0 =0 F’(1) = 2.1 = 2 F’(2) = 2.2 = 4 F’(-1) = 2(-1) = -2 9) Ache a oitava derivada de . Pense antes! F(8) (x) = 0. 10) Ache a equação da reta tangente ao gráfico de f em (1,1), onde f é dada por . a = f’(1) = 6.1²-4.1 = 2 y – y0=a(x-x0) (y-1= 2(x-1)( y-1 =2x-2( y = 2x-2+1 = => y = 2x-1 11) Ache a equação da reta tangente ao gráfico de em t = 4. Esboce o gráfico de f(t) e da reta tangente nos mesmos eixos. f’(t) = 6-2t ( f’(4) = 6-2.4 = -2 y= f(4) = 6.4-4² = 8 y – y0=a(x-x0) ( y-8 = -2(t-4)( y = -2t+8+8 ( y = -2t+16 12) Sendo A, B e C constantes, ache as derivadas das seguintes funções: (+ exponencial e logarítmica) � (y’ = 10t+4et ( y’ =2ex +2x ( f’(x) = 2x .ln2+2. 3x .ln3 ( y’ = 4.10x .ln10-3x² (y’ = 3-.4x .ln4 (y’ = 3x-1.ln3-33/2 x-3/2 = ( f’(x) = 3x² +3x.ln3 ( y’ = 5.5t .ln5 +6.6t .ln6 (p’(t) = Cet ( D’ = -1/p (R’ = 3.1/q = 3/q (y’=2t+5.1/t = 2t+5/t ( y’ = A.et ( f’(x) = Aex -2Bx ( P’ = 9t² +2et ( P’(t) = 3000.1,02t .ln1,02 ( P’(t) = 12,41. 0,94t .ln0,94 ( y’=5.2x.ln2 -5 (R’(q) = 2q-2.1/q = 2q-2/q ( y’ = 2x+4+3.1/x = 2x+4+3/x ( f’(t) = Aet +B.1/t =Aet +B/t � 13) Ache as derivadas das seguintes funções: (+ regra da cadeia) � ( f’(x) = 99.(x+1)98.1= 99(x+1)98 ( R’= 4 .2q=8q. ( w’ = 100.(t2+1)99.2t = 200t.(t2+1)99 ( w’=100.(t3+1)99.3t2=300t2(t3=1)99 ( w’=3.(5r-6)2.5=15.(5r-6)2 ( f’(t) = 3.e3t ( f’(t)=0,7 e0,7t ( f’(t)=-4 e-4t ( y’=1/2(s3+1)-½.3s2=3s2/2(s3+1)-½ ( w’= ½ s-1/2 ( P’=-0,2 e-0,2t ( w’=-6t ( y’= ( P’= 50.(-0,6) e-0,6t = -30. e-0,6t ( P’=200.0,12 e0,12t= 24 e0,12t ( y’=-6x+2.3e3x=-6x+6e3x ( C’=12.3(3q2-5)2.6q=216q(3q2-5)2. ( f’(x) =6.5e5x-2x =30e5x-2x ( y’= 5.5e5t+1=25 e5t+1 ( f’(x)= ( f’(x)= ( f’(x)= ( f’(x)= ( f’(t)= 5. = ( g’(t)= ( y’= ( Q’=100.0,5(t2+5)-0,5.2t=100(t2+5)-0,5 ( y’=5+ ( y’ = 2.(5+ex)1.ex= 2ex(5+ex) (P’=0,5(1+lnx)-0,5.1/x� 14) Se , ache f’(x) de dois modos: usando a regra do produto e antes efetuando a multiplicação para depois derivar. Compare os resultados! Regra do produto( f’(x) =2x(x³+5) +x²(3x²) = 2x4 +10x +3x4 = 5x4 +10x Multiplicando antes( f(x) = x5 +5x² (f’(x) = 5x4 +10x 15) Se , ache f’(x) de dois modos: usando a regra do produto e antes efetuando a multiplicação para depois derivar. Compare os resultados! Regra do produto( f’(x) =2(3x-2) +(2x+1)3 = 6x-4+6x+3 = 12x-1 Multiplicando antes( f(x) = 6x² -4x+3x-2 = 6x² -x-2 ( f’(x) = 12x -1 16) Ache as derivadas das seguintes funções: (+ regra do produto e do quociente) ( f’(x) = 1.ex+x.ex= ex(1+x) ( f’(t) =1.e-2t+t.(-2)e-2t=e-2t-2te-2t ( y’=1.2x+x.2x.ln2 ( y’=5. +5x.2x =5 +10x2 ( y’=2t.(4t+1)3+t2.3(4t+1)2.4=2t+(4t+1) ( y’=1.lnx+x.1/x = lnx+1 ( w’=(3t2+5).(t2-7t+2)+(t3+5t).(2t-7) ( y’=2t.et+(t2+3).et ( z’=3.(5t+2)+(3t+1).5=15t+6+15t+5=30t+11 �� EMBED Equation.3 ( y’=(3t2-14t)et+(t3-7t2+1).et ( P’=2t.lnt+t2.1/t=2tlnt+t ( f’(x)= ( R’=3.e-q+3q.(-e-q)=3e-q -3qe-q (y’=1. + t.(-2t) = -2t2 ( f’(z) = ½.z -½ .e-z +z ½ .(-e-z) ( g’(p)=1.ln(2p+1)+p. =ln(2p+1)+ ( f’(t)=1.e5-2t+t(-2)e5-2t=e5-2t-2te5-2t ( f’(w)=10w. +(5w2+3).2w. ( f ’(x)= = ( w’= ( z’= ( y’= ( w’= = = ( y’= 17) Sendo A, B e C constantes, ache as derivadas das seguintes funções: (+ funções periódicas) ( y’ = 5.cos(x) ( P’ = -sen(t) ( y’ = 2t -5sen(t) (y’ = Acos(t) ( y’ = 5cos(x) -5 ( R’(q) = 2q+2cos(q) ( R’ = cos(5t).5 ( W’ = 4(-sen(t²)).2t = -8tsen(t²) ( y’ = A.cos(Bt).B = AB.cos(Bt) ( y’ = cos(x²).2x = 2x.cos(x²) ( y’ = 2.(-sen(5t).5) =-10sen(5t)( y’ = 6.cos(2t).2 +3.(-sen(4t).4 = 12cos(2t) -12sen(4t) ( f’(x) = cos(3x).3 = 3cos(3x) ( z’ = -sen((4() ( f’(x) = 2x.cos(x) +x² (-sen(x)) = 2xcos(x) –x²sen(x) ( f’(x) = 2sen(3x) -2x.cos(3x).3 = 2sen(3x) -6xcos(3x) ( f’(t) = ( f’(() = 18) Sendo , sem construir o gráfico desta função, determine seu(s) ponto(s) de mínimo e de máximo, se existirem. Determine também o(s) intervalo(s) onde f(x) é crescente e o(s) intervalo(s) onde f(x) é decrescente, se existirem. f’(x)= 2x-1 f’(x) >0( 2x-1>0 ( 2x>1 ( x >1/2 ( f é crescente f’(x) <0( 2x-1<0 ( 2x<1 ( x<>1/2 ( f é decrescente + - 1/2 f’(x) = 0 ( 2x-1 = 0 ( 2x = 1( x = ½ é ponto crítico. Pela ordem das setas (sinal da derivada) , vemos que ½ é ponto mínimo local. 19) Sendo , sem construir o gráfico desta função, determine seu(s) ponto(s) de mínimo e de máximo, se existirem. Determine também o(s) intervalo(s) onde f(x) é crescente e o(s) intervalo(s) onde f(x) é decrescente, se existirem. f’(x) = 2x² -4x-12 = 0 D = (-4)² - 4.2.(-12) = 16+96=112 X = (4±10,6)/4 ( x1 = 3,65 e x2 = -1,65 são pontos críticos. + - + -1,65 3,65 Para x < -1,65 ou x > 3,65 temos que f’(x) >0, ou seja, em (-(,-1,65) ((3,65, +() f é crescente. Para -1,65 < x < 3,65 temos que f’(x) <0, ou seja, em (-1,65, 3,65) f é decrescente. Pela ordem dos sinais da derivada vemos que -1,65 é ponto mínimo local e 3,65 é ponto máximo local 20) Sendo , sem construir o gráfico desta função, determine seu(s) ponto(s) de mínimo e de máximo, se existirem. Determine também o(s) intervalo(s) onde f(x) é crescente e o(s) intervalo(s) onde f(x) é decrescente, se existirem. F’(x) = 3(x-5)² .1 = 3(x-5)² = 0 ( x-5 =0 ( x = 5 é ponto crítico. Como f’(x) = 3(x-5)² >0 para todo x real temos que f é sempre crescente. E não há ponto máximo nem ponto mínimo local. 21) Calcule a quinta derivada das funções: f(x) = x10- 5x2+5 f’(x) = 10x9 -10x f’’(x) = 90x8 -10 f’’’(x) = 720x7 f(4) (x) = 5040x6 f(5) (x) = 30240x5 f(x) = 3x7 - x5 f’(x) = 21x6 – 5x4 f’’(x) = 126x5 – 20x3 f’’’(x) = 630x4 – 60x² f(4) (x) = 2520x3 – 120x f(5) (x) = 7560x²– 120 f(x) = = x-1 f’(x) = -1x-2 f’’(x) = 2x-3 f’’’(x) = -6x-4 f(4) (x) = 24x-5 f(5) (x) = 120x-6 = 120 / x6 f(x) = e2x f’(x) = e2x.2 =2. e2x.2 f’’(x) = 2.e2x.2 = 4 e2x f’’’(x) = 4. e2x.2= 8e2x f(4) (x) = 8. e2x.2 = 16 e2x f(5) (x) = 16. e2x.2=32 e2x f(x) = = x-4 f’(x) = -4x-5 f’’(x) = 20x-6 f’’’(x) = -120x-7 f(4) (x) = 840x-8 f(5) (x) = 6720x-9 = 6720 / x9 22) f(x) = e3-8x (f’(x) = e3-8x.(-8) = -8e3-8x f(x) = ln(2x-x4) (f’(x) = 2-4x³/2x-x4 f(x) = (5x-3x2)4 ( f’(x) = 4. (5x-3x2)3 f(x) = ( f(x) = sen (4x-2) (y’ =cos(4x-2) .4 = 4cos(4x-2) f(x) = cos (x2-1) ( y’ = -sen(x²-1) .2x = -2xsen(x²-1) g) y = (2x-4)3 ( y’ = 3.(2x-4)³.2=6(2x-4)³ h) y = (4 – 7x)7 ( y’ = 7.(4-7x)6.(-7) = -49(4-7x)6 i) y = 2.e3x-1 ( y’ = 2.3 e3x-1 = 6.e3x-1 j) y = 5.e2-x ( y’ = 5.(-1) e2-x = -5 e2-x k) y = ln (3x-4) ( y’ = l) y = log 2 ( x+x2) ( y’ = m) y = 102x-3 ( y’ = 2. 102x-3.ln10 n) y = =(3x+9)1/2 ( y’ = ½ (3x+9)-1/2 .3 = o) y = (ln(x))3 ( y’ = 3.(ln(x))².1/x = 3/x.(ln(x))². p) f(x) = e5x-12 ( f’(x) = e5x-12.5 = 5e5x-12 q) f(x) = ln(3x-x5) (f’(x) = (3-5x4)/(3x-x5) r) f(x) = (x-4x6)3 ( f’(x) = 3.(x-4x6)² .(1-24x5) s) f(x) = = ( t) f(x) = sen (3x4-x) ( f’(x) = cos(3x4 –x).(12x³-1) u) f(x) = cos (4 -3x) (f’(x) = -sen(4-3x)(-3) = 3sen(4-3x) v) y = (3x2+5)5 ( y’ = 5.(3x²+5)4.6x =30x(3x²+5)4 x) y = (x3 –3x2)4 ( y’ = 4(x³-3x²)3(3x²-6x)=(x³-3x²)(12x²-24x) z) y = ( y’ = 2x w) y = e5-2x (y’ = -2.e5-2x y) y = ln (x2-5x+1) ( y’ = aa) y = log (4-x2) ( y’ = bb) y = 23x + 5.(3-x2)6 + e5x+2(y’=3.23xln2+5.6(3-x²)5(-2x)+5e5x+2=3.23xln2-60x(3-x²)5+5e5x+2 cc) y = =(x²-5x)1/3 ( y’ = 1/3 (x²-5x)-2/3.(2x-5) = dd) y = (e5x+3)4=e20x+12 (y’ = 20e20x+12 23) a) y = x2.ex ( y’ = u’.v+u.v’ = 2x.ex+x².ex b) y = -x.ln(x) ( y’ = u’.v+u.v’ = -1.ln(x) +(-x).1/x = -ln(x) -1 c) y = x3. log(x) ( y’ = u’.v+u.v’ = 3x².log(x) +x³.1/x.ln10=3x².log(x) +x²/ln10 d) y = x. =x.x1/2 = x3/2 ( y’ = 3/2 .x1/2 =3/2 e) y = 3x5.e4x+2 (y’ = u’.v+u.v’ =15x4.e4x+2+3x54.e4x+2 = 15x4.e4x+2+12x5.e4x+2 f) y = (y’= = g) y = ( y’= h) y = ( y’ = i) y = ( j) y = 2x . x2 (y’ = u’.v+u.v’=2x.ln2.x²+2x.2x k) y = x.(x+3)3 (y’=u’.v+u.v’ = 1(x+3)3+x.3(x+3)².1 = (x+3)³+3x(x+3)² l) y = x2.(2x-1)4 ( y’ = 2x(2x-1)4+x².4(2x-1)³.2=2x(2x-1)4+8x²(2x-1)³ m) y = .x –1= xx1/2x-1 = x-1/2 (y’ = -1/2 x-3/2 n) y = 3x2 e2-x. ( y’=6x.e2-x+3x².(-1)e2-x =6xe2-x-3x²e2-x o) y = ( p) y = ( q) y = ( y’ = r) y = ( y’= �PAGE � �PAGE �5� _1210849983.unknown _1382939304.unknown _1382939337.unknown _1382939353.unknown _1382945233.unknown _1382947524.unknown _1382979756.unknown _1382985118.unknown _1382986773.unknown _1382986980.unknown _1382987249.unknown _1382985223.unknown _1382982264.unknown _1382982384.unknown _1382983360.unknown _1382980617.unknown _1382979692.unknown _1382979725.unknown _1382979680.unknown _1382946454.unknown _1382946706.unknown _1382946795.unknown _1382946515.unknown _1382945672.unknown _1382946161.unknown _1382946187.unknown _1382946110.unknown _1382945394.unknown _1382939361.unknown _1382941625.unknown _1382941977.unknown _1382944674.unknown _1382944956.unknown _1382944706.unknown _1382944197.unknown _1382941642.unknown _1382939365.unknown _1382941399.unknown _1382941411.unknown _1382939367.unknown _1382939369.unknown _1382939370.unknown _1382939368.unknown _1382939366.unknown 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