作业帮若COSa+3Sina=0计算2sinacosa-cos^2a+1=
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若COSa+3Sina=0计算2sinacosa-cos^2a+1=
若COSa+3Sina=0计算2sinacosa-cos^2a+1=
若COSa+3Sina=0计算2sinacosa-cos^2a+1=
若cosa+3sina=0计算2sinacosa-(cosa)^2+1=
cosa+3sina=0
cosa=-3sina
2sinacosa-(cosa)^2+1
=2sinacosa+1-(cosa)^2
=2sinacosa+(sina)^2
=sina*(2cosa+sina)
=sina*(2*3*(-sina)+sina)
=-5*(sina)^2