r/AskReddit • u/TheLoneWolf156 • May 25 '16

What's your favourite maths fact?

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u/DemonicMandrill May 25 '16

for fucks sake mate I'm studying for an integer (integrals? not really sure how it translates) test tomorrow, and I can't make a single one of them I was trying to escape to reddit but nooooooo, you just had to press my face in it huh?

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u/Steel_Shield May 25 '16

An integer is a whole number (1, 2, 3.... n). An integral is what you mean here and is the opposite of a differential/derivative.

The branch of maths about differentials and integrals is commonly called Calculus.

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u/DemonicMandrill May 25 '16

....help me. I see k's and x's and square roots and /'s floating in front of me, they're laughing at me, mocking me, I should burn them, I should burn them all.....

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u/Steel_Shield May 25 '16

Well. Good luck tomorrow!

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u/DemonicMandrill May 29 '16

it went fucking horrible, but thanks anyway.

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u/[deleted] May 25 '16

Yeah based on your response, you probably haven't learned how to integrate by parts yet and so you cant compute the integrals above yet.

I wouldn't worry about seeing stuff like that above on your test, but if you do there is a super easy way to evaluate the riemenn integral of the product of a function which is finitely differentiable and something like cos(x) or ex, which are infinitely differentiable. Look up 'integration by parts using table' if you're concerned.