The function is .

Apply derivative on each side with respect to .

From the Fundamental Theorem of Calculus part 1:

If is continuous on , then the function defined by , is continuous on  and differentiable on , and  .

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Therefore the derivative function is always positive.

Thus, the function is strictly monotonic and it is an one to one function.

Find .

From theorem 5.9:

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Equate to .

Integral property: .

From the above property we will get .

Therefore, .

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Substitute in .

Consider .

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Substitute in .

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