Integration of a composite function

In summary, the question is about integrating a composite function, specifically ∫f(g(x)) dx. One possible technique is substitution, but it depends on the specific values of f and g. There is not a general method for integration like there is for differentiation, but there is an analogue to the chain rule for integrals that states the derivative of the inside must appear outside.
  • #1
Nisheeth
2
0

Homework Statement


The question I have is a more general one, but one I can't find an anser to since I don't have any access to a book on integration at the moment.

How do we Integrate a composite function.

∫f(g(x)) dx

Homework Equations



The Attempt at a Solution

 
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  • #2
A technique that might work is substitution. But it depends on the specific values of f and g, really.
 
  • #3
Ok, so that means that there is not general method like for integration, as there is for differentiation?
Nonetheless thanks!
 
  • #4
Nisheeth said:
Ok, so that means that there is not general method like for integration, as there is for differentiation?
Nonetheless thanks!

If you have ∫f(g(x))g'(x)dx, then this is equal to the simpler ∫f(u)du. This is the analogue to the chain rule for integrals. I say it in words as, the derivative of the inside must appear outside.
 

1. What is integration of a composite function?

Integration of a composite function is a mathematical process where the integral of a composite function is evaluated. A composite function is a function that is made up of two or more functions combined together.

2. Why is integration of a composite function important?

Integration of a composite function is important because it allows us to find the area under a complex curve, which has practical applications in fields such as physics, engineering, and economics.

3. How is integration of a composite function different from regular integration?

The main difference is that integration of a composite function involves applying the chain rule to determine the appropriate substitution, while regular integration does not require this step. Additionally, integration of a composite function may involve multiple integration techniques, such as integration by parts or trigonometric substitution.

4. What are some common challenges when integrating a composite function?

One common challenge is correctly identifying the inner and outer functions in the composite function. Another challenge is determining the appropriate substitution to use, as it may not always be obvious. Additionally, integration of a composite function may require multiple integration techniques, which can be complicated and time-consuming.

5. Are there any tips for successfully integrating a composite function?

Some tips for successfully integrating a composite function include carefully identifying the inner and outer functions, choosing the appropriate substitution, and being familiar with various integration techniques. It is also helpful to practice and review basic integration rules and techniques before attempting to integrate a composite function.

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