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1. $$(cosA+sinA)^{2} +(cosA-sinA)^{2}$$ is equals to
(A): 1
(B): 1/2
(C): 2
(D): 0
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By: anil on 05 May 2019 02.18 am
Expression : $$(cosA+sinA)^{2} +(cosA-sinA)^{2}$$ = $$(cos^2 A + sin^2 A + 2.sin A.cos A) + (cos^2 A + sin^2 A - 2.sin A.cos A)$$ = $$(1 + 2.sin A.cos A) + (1 - 2.sin A.cos A)$$ = $$1 + 1 = 2$$ => Ans - (C)
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SSC CHSL 7 Jan 2017 Morning Shift
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