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

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Find $\"\"$ .

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$\"\"$

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Addition formula for sine function: $\"\"$ .

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$\"\"$ .

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Find the values of $\"\"$ :

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From figure (1):

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

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Rewrite the equation as $\"\"$ .

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Compare it with $\"\"$ .

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$\"\"$ .

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

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$\"\"$

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$\"\"$ .

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Observe figure(1):

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$\"\"$ lies in first quadrant.

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$\"\"$ .

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

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$\"\"$ .

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$\"\"$ .

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

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$\"\"$ .

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Find the values of $\"\"$ :

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From figure (2):

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

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Rewrite the equation as $\"\"$ .

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Compare it with $\"\"$ .

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$\"\"$ .

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

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$\"\"$

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$\"\"$

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$\"\"$

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Observe figure(1):

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

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$\"\"$ .

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$\"\"$ .

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

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$\"\"$ .

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$\"\"$ .

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$\"\"$

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

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$\"\"$

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$\"\"$ .

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$\"\"$ .