Question
The function f : R → R given by f(x) = x3 – 1 is:
- A one-one function.
- An onto function.
- A bijection.
- Neither one-one nor onto.
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$\sqrt{\text{x}-1}$
$\sqrt{\text{x}}$
$\sqrt{\text{x}+1}$
$-\sqrt{\text{x}}$
$\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad k \quad, \quad x=0$
$\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\frac{\cos ^{2} x-\sin ^{2} x-1}{\sqrt{x^{2}+1}-1} ,\,\,\, x>0$
is continuous at $x=0$, then $\frac{1}{a}+\frac{1}{b}+\frac{4}{k}$ is equal to :