$\"\"$

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Find the derivative of the function $\"\"$ .

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Apply derivative on each side with respect to $\"\"$ .

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$\"\"$ .

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

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Chain rule of derivative: $\"\"$ .

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$\"\"$

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$\"\"$

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Power rule of derivative: $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .