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Trying to understand an integration example

  • Thread starter OnceMore
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  • #1
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Hello.

I am having some trouble understanding an integration example we have. I have written it out in the attached pdf. I would be grateful if someone can help me undertand what is going on.

I assume you let a = (x-RP)/(√2 ΔRP) da to make the process easier, but I am, not sure how that becomes

1/(√2 ΔRP) dx

I thought if we took the top line to be a constant, that should have come out as zero?

-S
 

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  • #2
phyzguy
Science Advisor
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You make the substitution a = (x-RP)/(√2 ΔRP) , then take the derivative of this with respect to x. Everything but x is treated as a constant, so this gives
da/dx = 1/(√2 ΔRP), or dx = (√2 ΔRP) da.
 
  • #3
23
1
Hello,

Thanks for the reply. Right, yea, I think I understand that ...I will run through it a few times just to make sure.

Thanks.

-S
 

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