$$\begin{gathered} \mathrm{If} \mathrm{f}\left(\mathrm{x}\right) = \left|\mathrm{x}\right| + \left|\sin \left(\mathrm{x}\right)\right| \mathrm{for} \mathrm{x} \in \left(- \frac{\mathrm{\pi }}{2}, \frac{\mathrm{\pi }}{2}\right), \\ \mathrm{then} \mathrm{its} \mathrm{left} \mathrm{hand} \mathrm{derivative} \mathrm{at} \mathrm{x} = 0 \mathrm{is} \end{gathered}$$

• 0

• - 1

• - 2

• - 3

$\mathrm{If} \mathrm{u} = \mathrm{u}\left(\mathrm{x}, \mathrm{y}\right) = \sin \left(\mathrm{y} + \mathrm{ax}\right) - {\left(\mathrm{y} + \mathrm{ax}\right)}^2, \mathrm{then} \mathrm{it} \mathrm{implies}$

• ${\mathrm{u}}_{\mathrm{xx}} = {\mathrm{a}}^2 . {\mathrm{u}}_{\mathrm{yy}}$

• ${\mathrm{u}}_{\mathrm{yy}} = {\mathrm{a}}^2{\mathrm{u}}_{\mathrm{xx}}$

• ${\mathrm{u}}_{\mathrm{xx}} = - {\mathrm{a}}^2 . {\mathrm{u}}_{\mathrm{yy}}$

• ${\mathrm{u}}_{\mathrm{yy}} = - {\mathrm{a}}^2{\mathrm{u}}_{\mathrm{xx}}$

213.

$\underset{\mathrm{x}\to \infty }{\lim }{\left(\frac{\mathrm{x} + 6}{\mathrm{x} + 1}\right)}^{\mathrm{x} + 4} = ?$

• e⁴

• e⁶

• e⁵

• e

The coordinates of the point P on the curve $\mathrm{x} = \mathrm{a}\left(\mathrm{\theta } + \sin \left(\mathrm{\theta }\right)\right), \mathrm{y} = \mathrm{a}\left(1 - \cos \left(\mathrm{\theta }\right)\right),$ where the tangent is inclined at an angle $\frac{\mathrm{\pi }}{4}$ to x-axis, are

• $\left[\mathrm{a}\left(\frac{\mathrm{\pi }}{4} - 1\right), \mathrm{a}\right]$

• $\left[\mathrm{a}\left(\frac{\mathrm{\pi }}{2} + 1\right), \mathrm{a}\right]$

• $\left[\mathrm{a}\left(\frac{\mathrm{\pi }}{2}\right), \mathrm{a}\right]$

• (a, a)

$$\begin{gathered} \mathrm{If} \mathrm{f} :\hspace{0.17em}\left[- 2, 2\right] \to \mathrm{R} \mathrm{is} \mathrm{defined} \mathrm{by} \\ \mathrm{f}\left(\mathrm{x}\right) = \left\{\frac{\sqrt{1 + \mathrm{cx}} - \sqrt{1 - \mathrm{cx}}}{\mathrm{x}} \mathrm{for} - 2 \le \mathrm{x} \le 0 \\ \frac{\mathrm{x} + 3}{\mathrm{x} + 1} \mathrm{for} 0 \le \mathrm{x} \le 2\right\} \\ \mathrm{continuous} \mathrm{on} \left[- 2, 2\right], \mathrm{then} \mathrm{c} \mathrm{is} \mathrm{equal} \mathrm{to} \end{gathered}$$

• $\frac{2}{\sqrt{3}}$

• 3

• $\frac{3}{2}$

• $\frac{3}{\sqrt{2}}$

$\mathrm{If} \mathrm{f}\left(\mathrm{x}\right) = {\mathrm{xtan}}^{-1}\left(\mathrm{x}\right), \mathrm{then} \underset{\mathrm{x}\to 1}{\lim }\frac{\mathrm{f}\left(\mathrm{x}\right) - \mathrm{f}\left(1\right)}{\mathrm{x} - 1} = ?$

• $\frac{\mathrm{\pi } +\hspace{0.17em}3}{4}$

• $\frac{\mathrm{\pi }}{4}$

• $\frac{\mathrm{\pi } + 1}{4}$

• $\frac{\mathrm{\pi } +\hspace{0.17em}2}{4}$

The value of c in the Lagrange's mean value theorem for f(x) = $\sqrt{\mathrm{x} - 2}$ in the interval [2, 6] is

• $\frac{9}{2}$

• $\frac{5}{2}$

• 3

• 4

$\mathrm{If} \mathrm{g}\left(\mathrm{x}\right) = \frac{\mathrm{x}}{\left|\mathrm{x}\right|} \mathrm{for} \mathrm{x}> 2, \mathrm{then} \underset{\mathrm{x}\to 2}{\lim } \frac{\mathrm{g}\left(\mathrm{x}\right) - \mathrm{g}\left(2\right)}{\mathrm{x} - 2} = ?$

•  - 1

• 0

• 1/2

• 1

$\underset{\mathrm{x}\to \frac{\mathrm{\pi }}{2}}{\lim }\left(\frac{2\mathrm{x} - \mathrm{\pi }}{\cos \left(\mathrm{x}\right)}\right) = ?$

• 0

• 1/2

•  - 2

• 5

$$\begin{gathered} \mathrm{If} \mathrm{f} \mathrm{is} \mathrm{defined} \mathrm{by} \mathrm{f}\left(\mathrm{x}\right) =\left\{ \mathrm{x} \mathrm{for} 0 \le \mathrm{x} \le 1 \\ 2 - \mathrm{x} \mathrm{for} \mathrm{x} \ge 1\right\}, \mathrm{then} \mathrm{at} \mathrm{x} = 1, \mathrm{f}\left(\mathrm{x}\right) \mathrm{is} \end{gathered}$$

• continuous and differentable

• Continuous but not differentiable

• discontinuous but differentiable

• Neither continuous nor differentiable