1. If cos(A-B) - cos(A+B) = x, then the value of x is
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By: anil on 05 May 2019 02.10 am
Expression : cos(A-B) - cos(A+B) = x = $$(cos Acos B + sin Asin B) - (cos Acos B - sin Asin B)$$ = $$sin Asin B + sin Asin B = 2sin Asin B$$ => Ans - (A)
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