cosA/1+sinA+1+sinA/cosA=2secA
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LHS: cos a/1+sin A + 1+sin A/cos A
cos A(cos A) +(1+sin A)(1+sin A)/(1+sin A) cos A
(cos ^A+ sin ^ A + 1+ 2 sin A)/(1+ sin A) cos A
2(1+1 sin A)/cos A ( 1+ sin A)
2/ cos A
2 sec A.
LHS = RHS. (proved)
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