Question
$\tan 75^\circ - \cot 75^\circ = $
$ = (2 + \sqrt 3 ) - (2 - \sqrt 3 ) = 2\sqrt 3 $.
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$f(x)=\left\{\begin{array}{ll}\frac{x^{3}}{(1-\cos 2 x)^{2}} \log _{e}\left(\frac{1+2 x e^{-2 x}}{\left(1-x e^{-x}\right)^{2}}\right), & x \neq 0 \\ \,\alpha & , x=0\end{array}\right.$ द्वारा परिभाषित है। यदि $x =0$ पर $f$ संतत है, तो $\alpha$ बराबर है -