\

The functions are $\"\"$ and $\"\"$ .

\

Find $\"\"$ .

\

$\"\"$

\

Apply sum formula : $\"\"$ .

\

$\"\"$ .

\

\

Find the value of $\"\"$ :

\

From figure (1):

\

The circle equation is $\"\"$ and point is $\"\"$ .

\

Rewrite the equation: $\"\"$ .

\

It is in the form of $\"\"$ .

\

Then $\"\"$ .

\

Substitute the point $\"\"$ in a circle equation.

\

$\"\"$

\

$\"\"$ .

\

Observe figure(1) :

\

$\"\"$ lies in first quadrant.

\

$\"\"$ .

\

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

\

$\"\"$ .

\

$\"\"$ .

\

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

\

$\"\"$ .

\

$\"\"$ .

\

$\"\"$ .

\

\

Find the value of $\"\"$ :

\

From figure (2):

\

The circle is $\"\"$ and point is $\"\"$ .

\

Rewrite the equation: $\"\"$ .

\

It is in the form of $\"\"$ .

\

Then $\"\"$ .

\

Substitute the point $\"\"$ in a circle equation.

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

Observe figure(1) :

\

The point lies in quadrant IV, then $\"\"$ .

\

$\"\"$ .

\

$\"\"$ .

\

As $\"\"$ lies in quadrant IV.

\

$\"\"$ .

\

$\"\"$ .

\

$\"\"$ .

\

$\"\"$ .

\

\

Consider $\"\"$

\

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

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

$\"\"$ .

\

\

$\"\"$ .