$\"\"$

The differential equation is $\"\"$ .

The function is $\"\"$ .

Derivative on each side with respect to $\"\"$ .

$\"\"$

Power rule of derivative : $\"\"$ .

$\"\"$

$\"\"$ .

$\"\"$

The differential equation is $\"\"$ .

Consider $\"\"$ .

Substitute $\"\"$ and $\"\"$ in the above function.

$\"\"$

Therefore, $\"\"$ .

$\"\"$ is not a solution of the differential equation.

$\"\"$

$\"\"$ .

$\"\"$ is not a solution of the differential equation.