(cosa+sina)^2-(cosa-sina)^2+cosa×sina=cos^2a+sin^2a+2cosa*sina-cos^2a-sin^2a+2sina*cosa+cosa*sins=5cosa*sina
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(cosa+sina)^2-(cosa-sina)^2+cosa×sina=cos^2a+sin^2a+2cosa*sina-cos^2a-sin^2a+2sina*cosa+cosa*sins=5cosa*sina