Which of the following identities is true for all permissible values of ?

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

Problem

Which of the following identities is true for all permissible values of

\theta

? (a)

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

(b)

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

(c)

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

(d)

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