$\"\"$

\

$\"\"$ is differentiable function of $\"\"$ is $\"\"$ .

\

$\"\"$ .

\

$\"\"$ is differentiable function of $\"\"$ is $\"\"$ .

\

$\"\"$ .

\

$\"\"$ is differentiable function of $\"\"$ is $\"\"$ .

\

$\"\"$ .

\

Consider $\"\"$ .

\

Substitute $\"\"$ .

\

$\"\"$

\

Substitute $\"\"$ .

\

The function is $\"\"$ .

\

$\"\"$

\

Apply derivative on each side with respect to $\"\"$ .

\

$\"\"$

\

Apply chain rule of derivatives: $\"\"$ .

\

$\"\"$

\

$\"\"$

\

Substitute $\"\"$ .

\

$\"\"$

\

Substitute $\"\"$ and $\"\"$ .

\

$\"\"$

\

Substitute $\"\"$ .

\

$\"\"$ .

\

$\"\"$ .

\

The statement is true.

\

$\"\"$

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The statement is true.