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0 votes
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in Sets, relations and functions by (53.1k points)

If f (x) = cos(log x) then f (x)f (y) − {(1/2)[ (fx/y) +f(xy)} is

(A)  -1 

(B)  1/2

(C)  -2

(D)  None of these

1 Answer

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by (53.3k points)
selected by
 
Best answer

Correct option (D) None of these

Explanation :

Given that

f(x) = cos(log x) ⇒ f(y) = cos(logy)

Therefore,

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