Prove that sin A/1-cos A = cosec A + cotA
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sinA1−cosA=cscA+cotA
RHS
cscA+cotA=1sinA+cosAsinA=(1+cosA)sinA=(1+cosA)(1−cosA)sinA(1−cosA)
=1−cos2AsinA(1−cosA)=sin2AsinA(1−cosA)=sinA1−cosA .LHS
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