Question

(tan^2x+1)cos^2x

Answer 1

Note that \(\tan^2x + 1=\sec^2 x\). So what does \((\tan^2x+1)\cos^2x\) equal? :-)

Answer 2

Welcome to OpenStudy!!

Hint: What is the reciprocal of (cos x)^2?

Answer 3

Julia: Hope you're getting something from this discussion.
Other potential helpers and I would appreciate your sticking around at least until you've made some progress towards solving the problem you've posted, or your informing them that you are leaving. Do onto others as you'd have them do onto you, please.