Question
Prove that cos3x/cosx-cos6x/cos2x=2(cos2x-cos4x)
Answers
Steve
cos3x = cosx(2cos2x - 1)
similarly,
cos6x = cos2x(2cos4x - 1)
I think you can see where this is going, right?
similarly,
cos6x = cos2x(2cos4x - 1)
I think you can see where this is going, right?
Melchert
Yes