Question

cos2x=2cos^2x-1, can somebody tell other formulas, dont write inappropriate answer's, plz give other full answers, correct answers will be marked as brainliest answ.​

Answer 1

Answer:

cos2x=cos (x + x)

= cos x cos x - sin x sin x

= cos^2x - sin^2x

Now,

cos2x= cos^2x - sin^2x

= (1 - sin^2x - sin^2x) [ as, cos^2x= (1 - sin^2x )]

= ( 1 - 2sin^2x )