Cos^2 (wt+a) = 1+Cos(2wt+2a)
(have an omega: ω and try using the X2 tag just above the Reply box )
(hmm … there's a factor of 2 missing …)
You need to learn all the standard trigonometric identities …
this one is 2cos2x = 1 + cos2x
(rather like 2sin2x = 1 - cos2x …
try adding and subtracting them )
I'm indeed ashamed that I'm studying Signals course and not aware of complete trigonometric identities. Thanks a lot for your help.
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