Derivative of an integral with both limits as functions of x?

In summary, the problem is to find the derivative of the given integral, which involves using the Fundamental Theorem of Calculus and the chain rule. To approach this problem, one can rewrite the integral as the difference of two integrals, each with a single limit that is a function of x. The key is to find a function G(x) with the property that its derivative is 1/(1+x^3).
  • #1
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Homework Statement



Find the derivative of:

[tex] \int_{tan(x)}^{2x^{2}} \frac {1}{\sqrt{1+t^{3}}} dt [/tex]

Homework Equations



[tex] \frac{d}{dx} \int_{a}^{x} f(t) dt = f(x) [/tex]

The Attempt at a Solution



I don't have an attempt because I do not know how to handle the problem... the FTC statement in 'Relevant equations' is only for the integral from a constant to a function of x, right? Help!
 
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  • #2
You can pick a constant and write that integral as the difference of two integrals, each of which only has a single limit that is a function of x.
 
  • #3
Recall that the integral of f from a to b equals F(b) - F(a), where F' = f. Suppose there exists a function G(x) with the property that G'(x) = 1/(1+x^3). Don't forget the chain rule.
 

1. What is the derivative of an integral with both limits as functions of x?

The derivative of an integral with both limits as functions of x is known as the fundamental theorem of calculus. It states that if a function f(x) is continuous on the closed interval [a,b] and F(x) is the integral of f(x) with upper limit x, then the derivative of F(x) is equal to f(x).

2. How do you solve for the derivative of an integral with both limits as functions of x?

To solve for the derivative of an integral with both limits as functions of x, you can use the chain rule and the fundamental theorem of calculus. First, evaluate the integral with the upper limit x and then take the derivative with respect to x, treating the upper limit as a function.

3. Can the constant of integration be included when differentiating an integral with both limits as functions of x?

Yes, the constant of integration can be included when differentiating an integral with both limits as functions of x. This is because the constant is absorbed into the derivative when the integral is evaluated. However, it is important to note that the constant may not be included if the integral has specific initial conditions.

4. What is the difference between an indefinite integral and a definite integral with both limits as functions of x?

An indefinite integral is a function that represents the antiderivative of a given function, while a definite integral is a number that represents the area under the curve of a given function between two points. When both limits of a definite integral are functions of x, it is known as a path-dependent integral, which can be used to find the total change in a function along a specific path.

5. Can the chain rule be applied to an integral with both limits as functions of x?

Yes, the chain rule can be applied to an integral with both limits as functions of x. When taking the derivative of an integral with both limits as functions of x, the chain rule is used to differentiate the upper limit, treating it as a function, while the lower limit remains constant. This allows for the derivative to be calculated without having to solve the integral first.

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