sinA/ [1+cosA]= cosecA - cotA
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sinA/(1+cosA)
=sinA/(1+cosA)×(1-cosA)/(1-cosA)
=sinA-sinA cosA /1-cos2(A)
=sinA/1-cos2(A)-sinA cosA/1-cos2(A)
=sinA/sin2(A)-sinA cosA/sin2(A)
=cosecA-cotA
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