prove that (cosA)/(1 + sin A) + (1 + sin A)/(cos A) = 2 sec(A)
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Answer:
LHS = cosA / 1+sinA + 1+sinA / cosA
=(cos^2A+1+sin^2A+2sinA ) /cosA(1+sinA)
= (2+2sinA) / cosA(1+sinA)
= {2(1+sinA)} / cosA (1+sinA)
= 2 / cosA
= 2secA
RHS = 2secA
therefore , LHS = RHS
Hence, proved.
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