To begin verifying the identity

MATHEMATICS · Single correct · CBSE · Mathematics · Introduction to Trigonometry · Introduction to Trigonometry

Problem

\dfrac{1}{1+\tan^2\theta}= \cos^2\theta

, which fundamental trigonometric identity should be applied first to transform the left-hand side? (a)

\tan\theta = \dfrac{\sin\theta}{\cos\theta}

(b)

\sec^2\theta - \tan^2\theta = 1

(c)

1+\tan^2\theta = \sec^2\theta

(d)

\sin^2\theta + \cos^2\theta = 1