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What's your favorite math equation/formula/theorem?

I have always loved the one the only Pythagorean theorem
Probability formula. I keep calculating my chance to win the lottery.
@ryan121 said in #4:
> Probability formula. I keep calculating my chance to win the lottery.

I did that for years, and always got the same answer...
Bugger-all plus or minus zero.
@obladie said in #5:
> I did that for years, and always got the same answer...
> Bugger-all plus or minus zero.
I get same answers. Better than spending it on alcohol and cigarettes I guess.
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Trigonometric equation and identities. Useless in daily life yet fascinates me.
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