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# HARD integration watch

1. For the following link for question 36 I don't understand what you can get rid of a term in an integral due to an odd integrand- how do u know it is odd. Thank you very much
2. (Original post by runny4)
For the following link for question 36 I don't understand what you can get rid of a term in an integral due to an odd integrand- how do u know it is odd. Thank you very much
Link does not work for me.
3. (Original post by runny4)
For the following link for question 36 I don't understand what you can get rid of a term in an integral due to an odd integrand- how do u know it is odd. Thank you very much
Link is disrupted, I can't solve if you can't resolve...
4. (Original post by runny4)
For the following link for question 36 I don't understand what you can get rid of a term in an integral due to an odd integrand- how do u know it is odd. Thank you very much
(Original post by 16Characters....)
Link does not work for me.
(Original post by Pilate VII)
Link is disrupted, I can't solve if you can't resolve...
as this is one of mine but I am a bit busy ...
see if this link works

5. (Original post by runny4)
For the following link for question 36 I don't understand what you can get rid of a term in an integral due to an odd integrand- how do u know it is odd. Thank you very much
For just that part, I'll call it f(u)

Hence an odd function.
6. Sub to see how that term is zero.

7. Let k=r^2-u^2 ,(dk/-2u)=du,substitute in to the integral and,then easy to integrate and final answer will be r(r-1) or r^2-r
8. (Original post by ghostwalker)
For just that part, I'll call it f(u)

Hence an odd function.
thanks

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