1.Relation and Function
medium

જો $f(x) = \sin \log x$, તો $f(xy) + f\left( {\frac{x}{y}} \right) - 2f(x).\cos \log y =$

A

$1$

B

$0$

C

$-1$

D

$\sin \log x.\cos \log y$

Solution

(b) $f(xy) = \sin \log xy = \sin \,(\log x + \log y)$…..$(i)$

$f(x/y) = \sin \log (x/y) = \sin \,(\log x – \log y)$…..$(ii)$

$\therefore \,\,f(xy) + f(x/y) = 2\,\sin \log x\cos \,\,\log y$

Hence required value of the function is

$2\,\sin \,\,\log x\,\cos \,\log y – 2\,\sin \,\log x\,\cos \,\log y = 0$.

Standard 12
Mathematics

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