$\"\"$

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The angle is $\"\"$ .

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Find $\"\"$ .

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Use sum formula of trigonometric function : $\"\"$ .

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$\"\"$

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$\"\"$ .

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$\"\"$

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Find $\"\"$ .

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Use sum formula of trigonometric function: $\"\"$ .

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$\"\"$

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$\"\"$ .

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$\"\"$

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Find $\"\"$ .

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Quotient identities of trigonometric function : $\"\"$ .

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$\"\"$

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Rationalize the fraction with $\"\"$ .

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$\"\"$

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$\"\"$ .

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$\"\"$

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$\"\"$ .

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$\"\"$ .

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$\"\"$ .