(sina+cosa)^2 + (sina-cosa)^2 -2
sin^2a+2sinacosa+cos^2a+cos^2a-2sinacosa+cos^2a-2=1+1-2=0
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sin^2a+2sinacosa+cos^2a+cos^2a-2sinacosa+cos^2a-2=1+1-2=0