prove the following identities
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sinA(1+cosA)/(1-cosA)(1+cosA)=sinA(1+cosA)/(1-cos²A)
=sinA(1+cosA)/sin²A=1/sinA+cosA/sinA=cosecA+cotA
=sinA(1+cosA)/sin²A=1/sinA+cosA/sinA=cosecA+cotA
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