$\"\"$

\

The function is $\"\"$ .

\

$\"\"$ .

\

Hence $\"\"$ .

\

$\"\"$

\

$\"\"$

\

From trigonometric table : $\"\"$ .

\

$\"\"$

\

Definition of inverse trigonometric function : $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$ .