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Sin3x. Cos 3pi/2-2x. Cos2x=sin(x+Pi/2). Sin(x/3-Pi/4)=1/2. 2sin3 Pi+x 1/2cos x-3pi/2.
Cos 3pi/2-2x. Cos2x=sin(x+Pi/2). Sin(x/3-Pi/4)=1/2. 2sin3 Pi+x 1/2cos x-3pi/2.

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