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If f(x)=sin(logx) then f(xy)+f(x/y)-2f(x...

If `f(x)=sin(logx)` then `f(xy)+f(x/y)-2f(x)cos(logy)=` (A) `cos(logx)` (B) `sin(logy)` (C) `cos(log(xy))` (D) 0

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