Changing Limits of Integration affects variable substitution?

In summary, changing the limits of integration can have a significant impact on variable substitution. It can potentially make a difficult integral easier to solve, but it also requires following certain rules and considering any additional boundaries or restrictions. It is important to change the limits when they do not correspond to the substituted variable, but this may also affect the accuracy of the integral.
  • #1
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  • #2
not exactly sure what the question is...

couple of points though, it is usually easier to use a different dummy variable when you use a subtitution

say you have
[tex] \int_b^a dt f(t) [/tex]

and want to change to u(t) = t/2, then
t=2u
dt = 2.du
u(a) = a/2
u(b) = b/2

so the integral becomes
[tex] \int_{b/2}^{a/2} 2.du f(2u) [/tex]

see how this compares with your case...
 
  • #3
thanks
 

1. How does changing the limits of integration affect variable substitution?

Changing the limits of integration in an integral affects variable substitution by altering the range of values that the substituted variable takes on. This can change the overall value of the integral and may require adjusting the substitution itself.

2. Can changing the limits of integration make a difficult integral easier to solve?

Yes, changing the limits of integration can sometimes make a difficult integral easier to solve. This is because different limits may allow for a more convenient substitution or may reduce the complexity of the integrand.

3. Are there any rules for changing the limits of integration when using variable substitution?

Yes, there are certain rules that must be followed when changing the limits of integration in variable substitution. These include adjusting the limits according to the new variable, and also considering any additional boundaries or restrictions that may apply.

4. How do I know when to change the limits of integration in a variable substitution?

You may need to change the limits of integration in a variable substitution when the original limits do not correspond to the limits of the substituted variable. This is often the case when the integral involves trigonometric functions or other non-linear functions.

5. Can changing the limits of integration affect the accuracy of the integral?

Yes, changing the limits of integration can potentially affect the accuracy of the integral. This is because the substituted variable may not cover the entire range of the original variables, leading to an incomplete evaluation of the integral.

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