Christos
Whats the integral of ln(x^2)
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zzr0ck3r
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ln(x^2) = 2ln(x)

zzr0ck3r
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what is the integral of ln(x)?

Christos
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1/x ?

zzr0ck3r
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no that's the derivative

Christos
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wait

zzr0ck3r
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hint: let u = ln(x) and let dv = 1 dx

zzr0ck3r
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try not to just give answers? we can go to wolfram for that

primeralph
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@zzr0ck3r still not the final answer; but I'll take it off

Christos
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xln(x) ? I still refuse to go by the answer :D

primeralph
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@Christos xlnx is not the answer. Use integration by parts

Christos
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xln(x)1

zzr0ck3r
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if you are just guessing you can go to wolframalpha and get the answer

Christos
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I am not guessing I though x has a power of 1 so 1 at the end and outside of ln whatever is inside

Christos
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I saw it somewhere long time ago but im not sure if its correct

zzr0ck3r
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u need to do integration by parts

zzr0ck3r
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is that what you are doing in class?

Christos
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What is this, can you give me an example?

Christos
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I am learning alone.

zzr0ck3r
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do you know what the product rule is with derivatives?

Christos
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I do

zzr0ck3r
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it is like the inverse of that, it is how we undo that rule.

zzr0ck3r
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I would google it and read on it, it takes practice

Christos
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the reverse?

zzr0ck3r
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sort of

zzr0ck3r
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do you know u substitution for integration?

Christos
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yes



zzr0ck3r
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e^(2*lnx) = e^ln(x^2) = x^2
so you need the integral of x^2 not ln(x^2)

Christos
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I solved it now :D I know how to find this thing very easy
(x^3)/3 without any actual formula

zzr0ck3r
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yeah:)

Christos
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thanks

zzr0ck3r
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np