sin(x+y)=sinxcosy+cosxsiny 具体推导：首先建立直角坐标系,在直角坐标系cos(x+y) = cosx cosy - sinx siny sin(x+y) = sinx cosy + cosx
证明sinx+cos(x+y)siny/cosx-sin(x+y)siny=tan(x+y)
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