Which of the following is the simplest form of the expression $\boldsymbol{\operatorname { t a n }}^{-\mathbf{1}}\left(\frac{\sqrt{\mathbf{1 + x ^ { \mathbf { 2 } }}}-\mathbf{1}}{\boldsymbol{x}}\right)$ where $x \neq 0$
$2 \tan ^{-1} x$
$\tan ^{-1} \frac{x}{2}$
$\frac{1}{2} \tan ^{-1} x$
$\tan ^{-1} x$
$$ \mathop {\lim }\limits_{x \to 0} \frac{(1-\cos 2 x)(3+\cos x)}{x \tan 4 x} \text { is equal to: } $$
3
2
4
1
A square plate is contracting at a uniform rate of $2 \mathrm{~cm}^2 / \mathrm{min}$. The rate at which the perimeter is decreasing when the side of the square is 16 cm is:
$\frac{1}{8} \mathrm{~cm} / \mathrm{min}$
$\frac{1}{4} \mathrm{~cm} / \mathrm{min}$
$16 \mathrm{~cm} / \mathrm{min}$
$32 \mathrm{~cm} / \mathrm{min}$
If $A=\{x: x$ is the first three odd numbers $\}$
$B=\{2 x+3: 0 \leq x<5, x \in \mathbb{N}\}$, then which of the following is true
$A \subset B$
$n(B)=5$
$A \cap B=\emptyset$
$A \cap B$ is a singleton set
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