1-sec^2x=_________ A. cot^2x B. tan^2x C. -tan^2x D. -cot^2x

1-sec^2x=_________

A. cot^2x

B. tan^2x

C. -tan^2x

D. -cot^2x

The question was asked during an online exam.

Origin of the question is Trigonometric Functions in chapter Trigonometric Functions of Mathematics – Class 11

Right option is C. -tan^2x

The explanation is: We know, sec^2x – tan^2x=1

So, 1-sec^2x=-tan^2x.