cos 2a=2cos2a1 solve it
Math
samyuktha200420
Question
cos 2a=2cos2a1 solve it
2 Answer

1. User Answers MarkAntony
9.99 is the ans for thisokay

2. User Answers Anonym
cos^2A=cos^2Asin^2A
= cos^2A(1cos2^A)
= cos^2A1+cos^2A
=2cos^2A1 .. RHS
... hope it's helpful...