If f ( x ) = cos (log x ), then f ( x ) f ( y ) - 1 2 [f ( x y )+f(x y) ] has the value
Mathematics · JEE Advanced · NTA Exams — Sets, Relations and Functions
If f (x) = cos (log x), then f (x) f (y)\(-\frac{1}{2}\left[f\left(\frac{x}{y}\right)+f(x y)\right]\) has the value
- –1
- –2
- none of these
Answer
(D) none of these
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