If f(x)=cos (log x), then f(x) · f(y)-1/2[f(x/y)+f(x y)] has the value (1983,1 M) (a) -1 (b) 1/2 ...

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If f(x)=cos (log x), then f(x) · f(y)-1/2[f(x/y)+f(x y)] has the value
(1983,1 M)
(a) -1
(b) 1/2
(c) -2
(d) None of these
hy cs Wallah min /2

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