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- Thread starter Typhon4ever
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- #2

Simon Bridge

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You are thinking too much of formulas and not enough of algebra.

What happens if you put r=lx?

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I'm not sure what you mean by what happens. Like, do the integral when r^2=l^2*x^2?

- #4

pwsnafu

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I'm not sure what you mean by what happens. Like, do the integral when r^2=l^2*x^2?

He means "do the substitution and write down what you get".

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- #6

Office_Shredder

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Integration by substitution, the integration technique, as opposed to integration by randomly plugging in other things

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Oh I went through it again and its simple u sub nevermind haha.

- #8

Simon Bridge

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(My emphasis.)Oh I went through it again andits simple u subnevermind haha.

If I said "substitute r=lu" you'd have been fine?

You have to look for these things ...

...the way forward will not normally look like some formula you've memorized.

Anyway you go there - well done.

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