- #1
siresmith
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2 answers to same integral??!!
Ive been giong mental over this. There seems to be two different answers to the same integral. I cant work out which is correct.
Integral from 0 to infinity of:
x(squared) exp(-2Bx(squared))
What is the right answer?
Integration by parts gives the answer as: -1/2B
My course lecturer gives the answer as: (1/8B) x route of (pie/2B)
I think she must have used the general formula:
Integral from -infinity to + infinity of x(power2n)exp(-Ax(squared)) = [1x3x5...(2n-1)]x(pie/A)/2(powern)A(powern)
and divided it by 2 as we only want the integral from 0 to infinity.
Whos right?? Can anyone work this out?
Please! write it down and see if you get the answer i did by integration by parts. If you do, do you think the lecturer is wrong?
Please help, i have an important exam tomorrow!
Homework Statement
Ive been giong mental over this. There seems to be two different answers to the same integral. I cant work out which is correct.
Integral from 0 to infinity of:
x(squared) exp(-2Bx(squared))
Homework Equations
What is the right answer?
The Attempt at a Solution
Integration by parts gives the answer as: -1/2B
My course lecturer gives the answer as: (1/8B) x route of (pie/2B)
I think she must have used the general formula:
Integral from -infinity to + infinity of x(power2n)exp(-Ax(squared)) = [1x3x5...(2n-1)]x(pie/A)/2(powern)A(powern)
and divided it by 2 as we only want the integral from 0 to infinity.
Whos right?? Can anyone work this out?
Please! write it down and see if you get the answer i did by integration by parts. If you do, do you think the lecturer is wrong?
Please help, i have an important exam tomorrow!