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If f(x) = cos(logx) then f(x) . f(y) - 1/2(f(x/y) + f(xy)) has the value (a) 1

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If f(x) = cos(logx) then f(x) . f(y) - 1/2(f(x/y) + f(xy)) has the value

(a) 1 

(b) -1 

(c) 0 

(d) 3

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1 Answer

+1 vote
by (71.8k points)

The correct option (c) 0

Explanation:

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