Tabela de Identidades

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Tabela de Identidades Trigonométricas
Prof. MSc Henrique Starick
1- sen2x + cos2x = 1
2- sen2x = 1 - cos2
3- cos2x = 1 - sen2x
4- tgx = senx 
 cosx
5- tgx . cosx = senx
6- cosx = senx
 tgx
7- cotgx = cosx
 senx
8- cotgx.senx = cosx
9- senx = cosx
 cotgx
10- secx = 1
 cosx
11- secx . cosx = 1
12- cosx = 1
 secx
13- cosecx = 1
 senx
14- cosecx . senx = 1
15- senx = 1
 cosecx
16- sec2x = 1
 cos2x
17- sec2x . cos2x = 1
18- cosec2x = 1
 sen2x
19- cosec2x.sen2x = 1
20- sec2x = 1 + tg2x
21- sec2x - tg2x = 1
22- cosec2x = 1 + cotg2x
23- cosec2x - cotg2x = 1
24- sen2x = 1 – cos2x
 2
25- cos2x = 1 + cos2x
 2
26- sen2x = 2senx.cosx
27- sen (-x) = -sen x 
28- cos (-x) = cos x
29- cos2x = cos2x – sen2x
30- cos2x = cos2x + sen2x
31- cos2x = 1 - 2 sen2x
32- cos2x = 2 cos2x – 1
33- tg x = senx
 2 1+ cos x
34- tg (-x) = -tg x
37-cos( a + b)= cosa.cosb – sena.senb
38-sen(a – b) = sena.cosb – senb.cos a
39-sen(a + b) = sena.cosb + senb.cosa