$\"\"$

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Observe the diagram.

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The trigonometric function : $\"\"$ .

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The acute angle is $\"\"$ .

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The length of opposite side to $\"\"$ is $\"\"$ .

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The length of adjacent side to $\"\"$ is $\"\"$ .

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$\"\"$

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$\"\"$ .

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

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$\"\"$

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