$\"\"$

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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 $\"\"$ in the integral function.

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$\"\"$

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Trignometric identity : $\"\"$ , then $\"\"$ .

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Substitute $\"\"$ in the above integral function.

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$\"\"$

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Reciprocal identitie: $\"\"$ and $\"\"$ .

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Substitute above function in integral function.

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$\"\"$

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Integral formula : $\"\"$ .

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$\"\"$

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$\"\"$

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Consider $\"\"$ .

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For a right triangle, $\"\"$ and $\"\"$ .

\

$\"\"$

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$\"\"$

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

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

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

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Substitute corresponding values in the equation $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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Quotient property of logarithms : $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .