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If f(x)="cos"((log)e x),t h e nf(x)f(y)-...

If `f(x)="cos"((log)_e x),t h e nf(x)f(y)-1/2[f(x/y)+f(x y)]` has value (a) `-1` (b) `1/2` (c) `-2` (d) none of these

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