$\"\"$

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The integral is $\"\"$ .

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Let $\"\"$ .

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Derivative each side with respect to $\"\"$ .

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$\"\"$

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Apply the derivatives of trigonometric function : $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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Substitute $\"\"$ and $\"\"$ in $\"\"$ .

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$\"\"$

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$\"\"$

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Use the integral formula: $\"\"$ .

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$\"\"$

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Replace $\"\"$ in $\"\"$ .

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$\"\"$

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$\"\"$ $\"\"$ .

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$\"\"$

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$\"\"$ $\"\"$ .