1 + cos(2x)-cos^2(x)=cos^2(x)
cos(2x)=cos^2(x)-sin^2(x)=cos^2(x)-1+cos^2(x) then substitute
1 + cos^2(x) - 1 + cos^2(x) - cos^2(x) =cos^2(x) QED
Lana L.
asked • 04/05/181+cos2x-cos^2x=cos^2x
Solve the proof
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