Question

$( - \infty, - 1) \cup \lbrack 1,\infty)f(x) = \frac{1}{\sqrt{|x| - x}}$equals –

• A. $R^{+}$
• B. $R^{-}$
• C. 1
• D. None of these

Answer 1

Answer: (A)

$R^{+}$

Answer 2

$\lim _ { x \rightarrow 0 }$ $\frac { \sqrt { 1 - 1 + \frac { x ^ { 4 } } { 2 ! } \ldots \ldots } } { 1 - 1 + \frac { x ^ { 2 } } { 2 ! } \ldots . . }$ = $\sqrt { 2 }$