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cos^2(pi//4+x) - sin^2(pi//4-x)...

`cos^2`(`pi//4`+x) - `sin^2`(`pi//4`-x)

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cos ((pi)/(4) - x) cos ((pi)/(4) -y) - sin ((pi)/(4) -x) sin ((pi)/(4) -y) = sin ( x +y)

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