#Integral of e^(x ln(x)) (1 + ln(x)) from 0 to 1

20 messages · Page 1 of 1 (latest)

rare shoal
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I need some guidance on how to solve this type of integrals.
I found that i can simplify it into: x^x (1 + ln(x)) and then study the 2 integrals:
-Integral x^x from 0 to 1
-Integral x^x*ln(x) from 0 to 1
Now i'm stack and unsure how to proceed with the evaluation of these integrals analytically.
Is there an analytical method or a standard result that I can use to solve these integrals, or should I consider using numerical approximation techniques? If so, what is the most efficient way to handle these integrals in an exam setting ?

vocal brookBOT
rare shoal
keen vale
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u = x ln x

rare shoal
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is correct that i have du = ln(x)+1 ?
if so my integral becomes: e^u du and my final resul is e-1 ?

keen vale
keen vale
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The u-sub maps the interval over which we integrate to a single point

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The mistake you made is likely that you forgot to change your bounds when doing the substitution

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You need to take the limit of u as x goes to each bound

rare shoal
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yep i still integrated from 0 to 1

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0 seems the correct answer

keen vale
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$\lim_{x \to 0} x\ln{x}$ isn't immediately apparent

modest shuttleBOT
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hiidostuff

rare shoal
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thank you, you opened my eyes (and saved me)

keen vale
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if all else fails a clever u-sub will work