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If f(x) = cos (log x), then f(1/x) f(1/x) -1/2[f(x/y) + f(xy)] is equal to

+2 votes
in JEE by kratos

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

f(1/x) f(1/x) -1/2[f(x/y) + f(xy)] is equal to

(a) cos (x-y)

(b) log (x-y)

(c) cos(x-y)

(d) of these

1 Answer

+3 votes
by kratos
 
Best answer

Correct Option**(d) of these**

Explanation:

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