MCQ
જો $f(x) = \frac{{1 - x}}{{1 + x}},$ તો $f[f(\cos \;2\theta )] = $
- A$\tan 2\theta $
- B$\sec 2\theta $
- ✓$\cos 2\theta $
- D$\cot 2\theta $
$ = f({\tan ^2}\theta ) = \frac{{1 - {{\tan }^2}\theta }}{{1 + {{\tan }^2}\theta }} = \cos \,\,2\theta .$
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કારણ $(R) : \,|\vec p \,\, - \,\,\vec q |\,\, = \,\,|\vec p \,\, + \,\,\vec q| $
આપેલ વિધાન જુઓ
$I$. $J>\frac{1}{4}$
$II$. $J<\frac{\pi}{8}$ હોય તો