Integration Tables: Robust Online Resources for \int x sin(ax) sin(bx) dx

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SUMMARY

The discussion centers on the search for robust online integration tables for the integral \(\int x \sin(ax) \sin(bx) \, dx\). The user expresses dissatisfaction with the results from Wolfram Alpha, specifically noting that while the output may be mathematically correct, it does not meet their specific needs. The provided solution involves complex trigonometric identities and requires further verification for practical application.

PREREQUISITES
  • Understanding of integral calculus, specifically trigonometric integrals.
  • Familiarity with online computational tools like Wolfram Alpha.
  • Knowledge of trigonometric identities and their applications in integration.
  • Basic skills in manipulating algebraic expressions involving sine and cosine functions.
NEXT STEPS
  • Explore alternative online integration tools such as Symbolab or Integral Calculator.
  • Study the derivation of the integral \(\int x \sin(ax) \sin(bx) \, dx\) using integration by parts.
  • Learn about the application of trigonometric identities in solving integrals.
  • Research advanced techniques in integral calculus, focusing on Fourier series and their relation to trigonometric integrals.
USEFUL FOR

Students, educators, and professionals in mathematics or engineering fields who require assistance with complex integrals, particularly those involving trigonometric functions.

Xkaliber
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Does anyone know of any online integration tables that are fairly robust?

I need to know how to integrate \int x sin(ax) sin(bx) dx
 
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integrals.wolfram.com/index.jsp doesn't work?

EDIT: Lol... I forgot how it bungles trig... it probably gives a right answer, but it's not the one you want
 
The calculator gave me \frac{1}{2}(\frac{cos((a-b)x)}{(a-b)^2}-\frac{cos((a+b)x)}{(a+b)^2}+\frac{xsin((a-b)x)}{(a-b)}-\frac{xsin((a+b)x)}{(a+b)})

Is this correct?
 

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