Question

Trig function identity Crisis!!!!

Cos 2s = 1-tan^2s/1+tan^2s ....
Just trying to figure out which trig formula to start with Left side??????.... is it COS^2 s - SIN ^2 s?
AAAAAAHHHH

Answer 1

yeh yoou can strat by cos 2s = cos^2 s - sin^2 s

Answer 2

*start

Answer 3

Cos^2s-Sin^2s= 1/sec^2s- 1-cos^2s ?

Answer 4

better would be if yoou take cos^2 s out and it will become