$\"\"$

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In the $\"\"$ , 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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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 $\"\"$ .