\"\"

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The function is \"\".

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Consider \"\".

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

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\"\"

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\"\"

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Substitute \"\" and \"\".

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\"\"

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\"\"

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Integral formula : \"\".

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\"\"

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Substitute \"\"  in the above equation.

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\"\"

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\"\"\"\".

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\"\"

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\"\"\"\".