Photos COS2 Π X

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Cos2 π x. Cos2x. 2sin2x=3cos2x. Sin ( 3 x - π/2 ) = (- 1). Cos(3pi/2+x).
Cos2x. 2sin2x=3cos2x. Sin ( 3 x - π/2 ) = (- 1). Cos(3pi/2+x).

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