(b).

\

The expression is $\"\"$ .

\

Leibnitz formula for the nth derivative of product : $\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

If n is even then $\"\"$ .

\

If n is odd then $\"\"$ .

\

(a).

\

The expression is $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

For kth derivative

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

If n is even then $\"\"$ .

\

If n is odd then $\"\"$ .