$\"\"$

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The trigonometric expression is $\"\"$ .

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$\"\"$ is cooresponds to the point $\"\"$ on the unit circle.

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Trigonometric function : $\"\"$ .

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$\"\"$

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$\"\"$ .

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$\"\"$

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Take the angle $\"\"$ .

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$\"\"$ is cooresponds to the point $\"\"$ on the unit circle.

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Trigonometric function : $\"\"$ .

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$\"\"$

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$\"\"$ .

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$\"\"$

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$\"\"$ .