$\"\"$

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From the diagram the acute angles are $\"\"$ and $\"\"$ .

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The sine and cosine values at $\"\"$ are $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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The sine and cosine values at $\"\"$ are $\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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The sine and cosine values at $\"\"$ and $\"\"$ are $\"\"$ , $\"\"$ ,

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