solve this sum in good way.
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sin/(1-cot)=sin/(1-cos/sin)=sin²/(sin-cos)
cos/(1-tan)=cos/(1-sin/cos)=cos²/(cos-sin)
(sin²-cos²)/(cos-sin)=-sin-cos
cos/(1-tan)=cos/(1-sin/cos)=cos²/(cos-sin)
(sin²-cos²)/(cos-sin)=-sin-cos
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