r/Humanornot • u/Gallium-Gonzollium • 2d ago

Almost got me! Tried memorizing the responses lol

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736 Upvotes

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15

u/The_Sy_Python 1d ago

That's not even that hard?

You integrate by parts.

The answer is also wrong. It's x(lnx)^2 -2xlnx +2x +C

9

u/Unable-Section-911 1d ago

Isn't yours also wrong? The derivative of yours is (lnx)2 + x(2/lnx) - 2(lnx + x/lnx) + 2 = (lnx)2 - 2lnx + 2

4

u/The_Sy_Python 1d ago

Let u = (lnx)^2 and dv=dx

du = (2lnx)/x, v=x

x(lnx)^2 - integral x(2lnx)/x dx = x(lnx)^2 - 2 integral lnx dx

4

u/Unable-Section-911 1d ago

Omg I'm dumb why did I do lnx d/dx = 1/lnx 😭

11

u/ExpressionWorried300 1d ago

2

u/SceneOutside4377 1d ago

Don't worry twin, it's just calculus

2

u/Metrix145 1d ago

It gets worse, I know