Question

P.T cos 2x=1-tan^2x/1+tan^2x​

Answer 1

Answer:

How do you simplify cos2x=1−tan2x1+tan2x?

Trigonometry  Fundamental Identities

1 Answer

Ratnaker Mehta

Mar 25, 2018

Answer:

Kindly go through a Proof in the Explanation.

Explanation:

We have, cos2x=cos2x−sin2x=cos2x−sin2x1,

=cos2x−sin2xcos2x+sin2x,

=cos2x{1−sin2xcos2x}cos2x{1+sin2xcos2x}.

⇒cos2x=