$\"\"$

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The function is $\"\"$

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Differentiate on each side with respect to $\"\"$ .

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$\"\"$

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Quotient Rule of derivatives : $\"\"$ .

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$\"\"$

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Derivative of tangent function: $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$