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

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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) 1/2

(c) -2

(d) None of these

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1 Answer

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The correct option (d) None of these

Explanation:

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If `f(x)=cos (logx)`, then `f(x)f(y)-1/2[f(x/y)+f(xy)]=`
asked Nov 18, 2019 in Mathematics by TanujKumar (71.2k points)

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