prove that 1/2(sinA/ 1+cosA + 1+cosA/sinA ) =1/sinA
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1/2((sin^2A+(1+cosA) ^2)/sinA(1+cosA)) =1/2((sin^2A+1+2cosA+cos^2A) /sinA(1+cosA)) =1/2(2+2cosA/sinA(1+cosA)) =1/2*2(1+cosA) /sinA(1+cosA) =1/sinA
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. prove that 1+cosa^2/sina=1+cosa/1-cosa
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