in Calculus retagged by
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a) 3/2

b) 2/3

c) 8/9

d) 8/13

in Calculus retagged by
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use the expansion of Cos 3x. Cos 3x=4cos^3 x - 3cos x. Hence, (Cos 3x +3 cos x)/4. Ans is B) 2/3
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