Is there a known formula for integrating cos^5x sin^5x?

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Homework Help Overview

The discussion revolves around the integration of the function cos5x sin5x, with participants exploring potential methods for solving the integral.

Discussion Character

  • Exploratory, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss an initial approach involving the substitution of sin2x and consider the implications of using u substitution. There are questions about the correctness of the proposed method and the resulting expression.

Discussion Status

The discussion includes attempts to verify the proposed solution through differentiation. Some participants express satisfaction with their understanding, while others seek clarification on the existence of known formulas related to the product of cosine and sine functions.

Contextual Notes

There is a mention of the constant of integration, indicating that participants are aware of the need to consider it in their solutions. The conversation reflects a mix of confidence and uncertainty regarding the methods discussed.

johnhuntsman
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∫cos^5 x sin^5 x dx

I thought I would try to solve this by first doing:

∫(1 - sin^2 x) cos^3 x sin^5 x dx

but would like to know if that's right.

[Edit] Is the answer something like (sin^6 x) / 6 - (sin^8 x) / 4 + (sin^10 x) / 10 ?[Edit]
 
Last edited:
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johnhuntsman said:
∫cos^5 x sin^5 x dx

I thought I would try to solve this by first doing:

∫(1 - sin^2 x) cos^3 x sin^5 x dx

but would like to know if that's right.

[Edit] Is the answer something like (sin^6 x) / 6 - (sin^8 x) / 4 + (sin^10 x) / 10 ?[Edit]
How did you get it?

Take the derivative, to check it.


Don't forget the constant of integration.
 
SammyS said:
How did you get it?

I split up the cos^3 x just like I did the cos before. Then used u substitution.

SammyS said:
Take the derivative, to check it.

I did. Thanks, everything's okey dokey now : D
 
I think simpler would be just to ask - is there any well known formula involving cosx.sin x ?
 

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