$\"\"$

Consider the function as $\"\"$ .

Find the derivative of the function.

Definition of derivative of the function : $\"\"$ .

$\"\"$

Derivative of the function is $\"\"$ .

Derivative of the function is negative.

Note : If a function is decreasing then its derivative is always negative.

Examples : $\"\"$ etc.

$\"\"$

Graph of the function $\"\"$ .

$\"\"$

The graph of the function $\"\"$ is:

$\"\"$ .