sin^2a+2sinacosa-cos^2a化简
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sin^2a+2sinacosa-cos^2a化简sin^2a+2sinacosa-cos^2a化简sin^2a+2sinacosa-cos^2a化简sin^2a+2sinacosa-cos^2a=2
sin^2a+2sinacosa-cos^2a化简
sin^2a+2sinacosa-cos^2a化简
sin^2a+2sinacosa-cos^2a化简
sin^2a+2sinacosa-cos^2a=2sinacosa-cos2a=sin2a-cos2a