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The values are $\"\"$ and $\"\"$ .

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Since $\"\"$ then $\"\"$ and $\"\"$ .

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The angle $\"\"$ is lies in first quadrant.

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The point $\"\"$ is lies on the curve of radius $\"\"$ .

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Thus,

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$\"\"$

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$\"\"$

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Since the point $\"\"$ lies in first quadrant consider $\"\"$ .

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The value of cosine function is $\"\"$ .

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$\"\"$ .

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$\"\"$ then $\"\"$ and $\"\"$ .

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The angle $\"\"$ lies in the fourth quadrant.

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The point $\"\"$ is lies on the curve of radius $\"\"$ .

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Thus,

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$\"\"$

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$\"\"$

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Since the point $\"\"$ lies in fourth quadrant, consider $\"\"$ .

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The value of cosine function is $\"\"$ .

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$\"\"$ .

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(a)

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The expression is $\"\"$

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Sum formula for the sine function : $\"\"$ .

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

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$\"\"$

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Thus, $\"\"$ .

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(b)

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The expression is $\"\"$ .

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Sum formula for the cosine function : $\"\"$ .

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

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$\"\"$

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Thus, $\"\"$ .

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(c)

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The expression is $\"\"$ .

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Difference formulas for the sine function : $\"\"$ .

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

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$\"\"$

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$\"\"$ .

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(d)

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The expression is $\"\"$ .

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$\"\"$ .

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Evaluation of $\"\"$ .

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Difference formulas for the cosine function : $\"\"$ .

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$\"\"$

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$\"\"$

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From (c), $\"\"$

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$\"\"$

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$\"\"$ .

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(a) $\"\"$ .

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(b) $\"\"$ .

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(c) $\"\"$ .

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(d). $\"\"$ .