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Tabela de Identidades Trigonométricas sen2x + cos2x = 1 sen2x = 1 - cos2 cos2x = 1 - sen2x tgx = senx cosx tgx . cosx = senx cosx = senx tgx cotgx = cosx senx cotgx.senx = cosx senx = cosx cotgx secx = 1 cosx secx . cosx = 1 cosx = 1 secx cosecx = 1 senx cosecx . senx = 1 senx = 1 cosecx sec2x = 1 cos2x sec2x . cos2x = 1 cosec2x = 1 sen2x cosec2x.sen2x = 1 sec2x = 1 + tg2x sec2x - tg2x = 1 cosec2x = 1 + cotg2x cosec2x - cotg2x = 1 sen2x = 1 – cos2x 2 cos2x = 1 + cos2x 2 sen2x = 2senx.cosx sen (-x) = -sen x cos (-x) = cos x cos2x = cos2x – sen2x cos2x = cos2x + sen2x cos2x = 1 - 2 sen2x cos2x = 2 cos2x – 1 tg x = senx 2 1+ cos x 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 35 36
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