sin(x-y)cosy+cos(x-y)siny=?

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sin(x-y)cosy+cos(x-y)siny=?sin(x-y)cosy+cos(x-y)siny=?sin(x-y)cosy+cos(x-y)siny=?sin(x-y)cosy+cos(x-

sin(x-y)cosy+cos(x-y)siny=?
sin(x-y)cosy+cos(x-y)siny=?

sin(x-y)cosy+cos(x-y)siny=?
sin(x-y)cosy+cos(x-y)siny
=sin(x-y+y)
=sinx