# Integration with sqrt in denominator

In summary, to integrate a function with a square root in the denominator, you can use the substitution method or the method of partial fractions. There are a few special cases to consider, such as using trigonometric substitutions. In some cases, you may be able to integrate without using substitution or partial fractions, but it is often necessary. This technique is commonly used in physics and engineering, particularly in problems involving motion and force.
I wonder how would I get out the integral when the denominator is square-rooted.

∫$\frac{1}{\sqrt{3x-x^2}}$ dx

3x-x² = (3/2)²-(x -(3/2) )²
Let (x -(3/2) )= (3/2)*sin(t)
or let (x -(3/2) )= (3/2)*sinh(t)

## 1. How do you integrate a function with a square root in the denominator?

To integrate a function with a square root in the denominator, you can use the substitution method or the method of partial fractions. Both methods involve manipulating the function to make it easier to integrate, and then using integration rules to solve.

## 2. Can you provide an example of integrating a function with a square root in the denominator?

Sure. For example, to integrate the function f(x) = 1/√(x+2), you can use the substitution u = x+2, which then changes the function to f(u) = 1/√u. This can be integrated using the power rule, resulting in √u + C. Substituting back in for u, the final answer is √(x+2) + C.

## 3. Are there any special cases to consider when integrating a function with a square root in the denominator?

Yes, there are a few special cases to consider. If the square root is in the form of √(ax+b), where a and b are constants, you can use the substitution u = ax+b to simplify the integration. If the square root is in the form of √(x^2+a^2), you can use the trigonometric substitution x = a tanθ to integrate the function. Finally, if the square root is in the form of √(x^2-a^2), you can use the trigonometric substitution x = a secθ to integrate the function.

## 4. Can you integrate a function with a square root in the denominator without using substitution or partial fractions?

In some cases, yes. If the function can be rewritten as a power function, such as √(x^2+1) being rewritten as (x^2+1)^(1/2), you can use the power rule to integrate it. However, if the function cannot be simplified in this way, you will likely need to use substitution or partial fractions to integrate it.

## 5. What are some real-life applications of integrating a function with a square root in the denominator?

Integrating functions with square roots in the denominator is commonly used in physics and engineering, particularly in problems involving motion and force. For example, finding the velocity or acceleration of an object at a given time often requires integration of a function with a square root in the denominator. It is also used in calculating the work done by a force over a distance, as well as in calculating the area under a curve in certain situations.

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