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Q.

If f(x) = sin (log x) then    f(xy)+fxy−2f(x)cos(logy)=

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a

cos (logx)

b

sin (logy)

c

cos (log (xy))

d

0

answer is D.

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Detailed Solution

sin(log x + log y) + sin(log x - log y) - 2sin (log x)cos(log y) = 0
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