cos 2a=2cos2a-1 solve it
Math
samyuktha200420
Question
cos 2a=2cos2a-1 solve it
2 Answer
-
1. User Answers MarkAntony
9.99 is the ans for thisokay
-
2. User Answers Anonym
cos^2A=cos^2A-sin^2A
= cos^2A-(1-cos2^A)
= cos^2A-1+cos^2A
=2cos^2A-1 .. RHS
... hope it's helpful...