MCQ
$\mathop {\lim }\limits_{x \to \infty } {\left( {1 + \frac{2}{x}} \right)^x} = $
- A$e$
- B$\frac{1}{e}$
- ✓${e^2}$
- DNone of these
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$x \operatorname{cosec} \alpha-y \sec \alpha=\operatorname{kcot} 2 \alpha$ and $x \sin \alpha+y \cos \alpha=k \sin 2 \alpha$
respectively, then $\mathrm{k}^{2}$ is equal to :