$\"\"$

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The integral is $\"\"$ .

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(a)

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

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Derivative formula : $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$ .

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$\"\"$

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(b)

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The integral is $\"\"$ .

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Consider $\"\"$ .

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Rewrite the above integral.

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$\"\"$

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Consider $\"\"$ .

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$\"\"$

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$\"\"$

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Substitute $\"\"$ and $\"\"$ in the integral.

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$\"\"$

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$\"\"$

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$\"\"$

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Substitute $\"\"$ in the expression.

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$\"\"$

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$\"\"$ .

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$\"\"$

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$\"\"$ .