sin(a-p)cosa-cos(p-a)sina=3/5sin(a-p)cosa+cos(a-p))sina=3/5

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sin(a-p)cosa-cos(p-a)sina=3/5
sin(a-p)cosa+cos(a-p))sina=3/5

sin(a-p)cosa-cos(p-a)sina=sin(a-p-a)=sin(-p)=3/5,则sinP=-3/5