The equation is .

Rewrite the expression:

Assume  and .

Consider .

Differentiate on each side with respect to .

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Consider .

Apply derivative on each side with respect to .

Rewrite the expression using chain rule.

.

Fundamental theorem of calculus :

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

Here .

From the fundamental theorem of calculus, part 1:

.

.

Replace  and  in above expression.

The derivative of the function .

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The derivative of the function .