$\"\"$

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The functions are $\"\"$ and $\"\"$ .

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Consider $\"\"$ .

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From the reciprocal identity : $\"\"$ .

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$\"\"$

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$\"\"$

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Pythagorean identity : $\"\"$ .

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$\"\"$

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Tangent function : $\"\"$ .

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$\"\"$

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$\"\"$ .

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$\"\"$

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The functions $\"\"$ and $\"\"$ are identically equal.