If f(x)=cos(log _e x), then f(x) f(y)-1/2[f(x/y)+f(x y)] has value (2) 1 / 2 (1) -1 (4) 0 (3) -2

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If f(x)=cos(log _e x), then f(x) f(y)-1/2[f(x/y)+f(x y)] has value
(2) 1 / 2
(1) -1
(4) 0
(3) -2

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