I don't understand why: (cosx)^2 (sinx)^2 = (1/4)(sin2x)^2 what identities are used here? Thanks!
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(cosx)^2 = ( (1 + cos2x) / 2 ) (sinx)^2 = ( (1 - cos2x) / 2 ) then, in the end 1 - (cos2x)^2 becomes (sin2x)^2
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