Which of the following equations is always true for every real value of ?

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

Problem

Which of the following equations is always true for every real value of

x

? (a)

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

(b)

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

(c)

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

(d)

1+\sin^2 x=\csc^2 x