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Multiple Choice Questions
1. (secA - 1)/(secA + 1) is equal to?
(A): (1 - sinA)/(1 + sinA)
(B): (1 + cosA)/(1 - cosA)
(C): (1 + sinA)/(1 - sinA)
(D): (1 - cosA)/(1 + cosA)
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By: anil on 05 May 2019 02.16 am
Expression : (secA - 1)/(secA + 1) = $$(frac{1}{cosA}-1)div(frac{1}{cosA}+1)$$ = $$(frac{1-cosA}{cosA})div(frac{1+cosA}{cosA})$$ = $$(frac{1-cosA}{cosA}) imes (frac{cosA}{1+cosA})$$ = $$frac{1-cosA}{1+cosA}$$ => Ans - (D)
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SSC CHSL 15 Jan 2017 Afternoon Shift
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