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If f(x) = cos (log (e) x), then f (x) f(...

If `f(x) = cos (log _(e) x),` then `f (x) f(y) -1/2 [f(xy) +f((x)/(y))]` has the value-

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If f (x)= cos (log _(e) x) then f (x) f (y) - 1/2 [f ((y)/(x)) + f (xy)] has the value :

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