Q. 125.0( 1 Vote )

Mark the correct alternative in the following:

If f(x) = cos (log x), then value of is

A. 1

B. -1

C. 0

D. ± 1

Answer :


Now,




Using:


=cos(log x) cos(log 4)-cos(log x)cos(4)


=0


Option C is correct..

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