Reciprocal identities sinu= 1 cscu cosu= 1 secu tanu= 1 cotu cotu= 1 tanu cscu= 1 sinu secu= 1 cosu Pythagorean Identities sin 2ucos u= 1 1tan2 u= sec2 u 1cot2 u= csc2 u Quotient Identities tanu= sinu cosu cotu= cosu sinu CoFunction Identities sin(ˇ 2 u) = cosu cos(ˇ 2 u) = sinu tan(ˇ 2 u) = cotu cot(ˇ 2 u) = tanu csc(ˇ 2 u) = secu secIf the angles are doubled, then the trigonometric identities for sin, cos and tan are sin 2θ = 2 sinθ cosθ;Cos 2θ = cos 2 θ – sin 2 θ = 2 cos 2 θ – 1 = 1 – sin 2 θ;
Solved Verify The Following Identities A Sec I Cos I Tan I Sin I B Csc 2 I 1 Tan 2 I Cot 2 I C Cos I I 2 Sin I Please Show Your Work