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1. cos(A+B) + cos(A-B) is equal to ?
(A): 2cosAcosB
(B): 2sinAsinB
(C): 2sinAcosB
(D): 2cosAsinB
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By: anil on 05 May 2019 02.10 am
Expression : cos(A+B) + cos(A-B) = $$(cosAcosB - sinAsinB) + (cosAcosB + sinAsinB)$$ = $$(cosAcosB+cosAcosB) + (sinAsinB-sinAsinB)$$ = $$2cosAcosB$$ => Ans - (A)
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SSC CHSL 1 Feb 2017 Morning Shift
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