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Find the correct trigonometric identity.(a) cos^2 θ = 1 – sin^2 θ(b) cos^2 θ = 1 + sin^2 θ(c) tan^2 θ + sec^2 θ = 1(d) tan^2 θ = sec^2 θ + 1This question was posed to me in final exam.This key question is from Trigonometric Identities in section Trigonometry of Mathematics – Class 10

Answer»

Correct ANSWER is (a) cos^2 θ = 1 – sin^2 θ

The explanation is: The APPROPRIATE TRIGONOMETRIC identity used here is sin^2 θ + cos^2 θ = 1.

cos^2 θ = 1 – sin^2 θ



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