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05-12-2017
03:27 PM

05-12-2017
03:27 PM

Hello again friends,

I have what is hopefully a simple headache in integration.

I am looking at the below and attached.

In yellow is the integral I am trying to work out manually as I need to be able to do this in a manual way. I have tried a 'nifty' short cut in red but this is way off.

Then I have tried integrating without the upper and lower limits of the integral by rearranging, expanding the brackets, then integrating. Then replacing z for -T and resolving. Although this gives me an answer with a extra 5 in the numerator?

Any ideas where I am going wrong?

A

Solved! Go to Solution.

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05-12-2017
06:00 PM

05-12-2017
06:00 PM

Concerning your "nifty short cut" - you'll have to explain what you had in mind! Which substitution which would generate those integral limits and I guess you forgot that you have replace the dz properly as well (so you are missing a factor T).

5 REPLIES 5

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05-12-2017
05:25 PM

05-12-2017
05:25 PM

Re: Integration Headache

basically two errors.

1) (-T)^2 is not the same as -T^2

2) -T is the lower limit, so you have to subtract the expression from 0 (sign change)

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05-12-2017
06:00 PM

05-12-2017
06:00 PM

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05-14-2017
08:21 AM

05-14-2017
08:21 AM

Re: Integration Headache

Cheers Werner,

A real rookie error on my part.

Andy,

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05-16-2017
11:26 AM

05-16-2017
11:26 AM

Re: Integration Headache

Here's a step by step solution

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05-16-2017
01:33 PM

05-16-2017
01:33 PM

Re: Integration Headache

For learning purposes one can also use one of the free online integral calculators which also show step by step solutions