PROVE :- 1-cosA/sinA=sinA/1+cosA
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sinA/1-cosA =1 +cosA/sinA
L.H.S= sinA/1-cosA
=sinA(1+cosA)/(1-cosA)(1+cosA)
=sinA(1+cosA)/1-cos^2(A)
=sinA(1+cosA)/sin^2(A)
=1 +cosA/sinA
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