If $f: R \rightarrow A$ defined by $f(x) = \frac{1}{x^2+2x+2}$,$\forall x \in R$ is surjective,then $A =$

The domain of the function $f(x) = \frac{1}{\sqrt{x+|x|}}$ is

Let $\rho$ be a relation defined on the set of natural numbers $N$, as $\rho = \{(x, y) \in N \times N: 2x + y = 41\}$. Then the domain $A$ and range $B$ are:

The function $f: R \rightarrow R$ is defined by $f(x) = \cos^2 x + \sin^4 x$ for $x \in R$. Then $f(R)$ is equal to:

Find the domain and range of the following real function:
$f(x) = -|x|$

The domain of the function $y = \frac{1}{\sqrt{|x| - x}}$ is