Question
32sin4acos2a=cos6a-2cos4a-cos2a+2prove that
Answers
oobleck
cos6a = cos(4a+2a) = cos4a cos2a - sin4a sin2a
cos4a = 2cos^2(2a)-1
see what you can do with that
cos4a = 2cos^2(2a)-1
see what you can do with that