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

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Q. If f(x) = cos (logx) then
$f\left(\frac{1}{x}\right)f\left(\frac{1}{y}\right)-\frac{1}{2}\left\{f\left(\frac{x}{y}\right)+f\left(xy\right)\right\}=$

Relations and Functions - Part 2

Solution:

Correct answer is (d) 0