$\"\"$

The function is $\"\"$ .

Differentiate the function with respect to $\"\"$ .

$\"\"$

Therefore, the derivative of the function has the same sign for all $\"\"$ in its domain.

$\"\"$

Consider $\"\"$ .

Substitute $\"\"$ in $\"\"$ .

$\"\"$

Substitute $\"\"$ in $\"\"$ .

$\"\"$

Since $\"\"$ , many different $\"\"$ - values yield the same $\"\"$ -value.

Therefore, the function $\"\"$ is not one-to-one.

$\"\"$

The function is not one-to-one, because many different $\"\"$ - values yield the same $\"\"$ -value.