$\"\"$

The functions are $\"g\\left$ and $\"h\\left$ .

(a) The function is $\"g\\left$ .

Differentiate on each side with respect to $\"x\"$ .

$\"g\'\\left$ .

Product rule of derivatives: $\"\\left$ .

$\"g\'\\left$

$\"g\'\\left$

Substitute $\"x=\\frac{\\pi$ in the above expression.

$\"g\'\\left$ .

We have , $\"f\\left$ , $\"f\'\\left$ , $\"\\cos\\left$ and $\"\\sin\\left$ .

Substitute above values in above expression.

$\"\\\\g\'\\left$

$\"\"$

(b) $\"h\\left$ .

Differentiate on each side with respect to $\"x\"$ .

$\"h\'\\left$ .

Product rule of derivatives: $\"\\left$ .

$\"\\\\h\'\\left$

Substitute $\"x=\\frac{\\pi$ in the above expression.

$\"\\\\h\'\\left$

Substitute corresponding values in the above expression.

$\"\\\\h\'\\left$

$\"\"$

(a) $\"\\\\\\\\g\'\\left$

(b) $\"\\\\h\'\\left$ .