$\"\"$

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Trigonometric function is $\"\"$ .

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Reciprocal Identity : $\"\"$ .

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$\"\"$

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$\"\"$

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Reduction Identiy : $\"\"$ .

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$\"\"$ .

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Values of trigonometric functions are $\"\"$ and $\"\"$ .

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$\"\"$

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Values of trigonometric functions are $\"\"$ and $\"\"$ .