sin^2a+2sinacosa-cos^2a化简
问题描述:
sin^2a+2sinacosa-cos^2a化简
答
sin^2a+2sinacosa-cos^2a=2sinacosa-cos2a=sin2a-cos2a
sin^2a+2sinacosa-cos^2a化简
sin^2a+2sinacosa-cos^2a=2sinacosa-cos2a=sin2a-cos2a