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chain rule

In calculus, the chain rule is used to differentiate compositions of functions. It states that for any function f which is dependent on a variable u, and u is a function of a second variable x, then f is a function of x.

In Set Theory:

f(u)=u V u(x)=x V Vf(x)

In Calculus:

df/dx = du/dx(dx/du)
to differentiate (x+1)^2, one could multiply this out and apply the sum rule (derivative of a sum is the sum of the derivatives); but what if it were (x+1)^55? Suddenly the multipling out doesn't look so nice. To apply the chain rule, we must first define the functions. Let f(x)=(x+1)^55 and u=(x+1). Therefore f(x)=u^55. By the chain rule:
df/dx = df/du(du/dx)
df/dx = d/du(u^55)(du/dx)
df/dx = 55u(du/dx)
We earlier defined the variable "u" as (x+1). Now we substitute this in.
df/dx = 55(x+1)d/dx(x+1)
df/dx = 55x+55(1)
df/dx = 55x+55
by Gladwarez July 10, 2006
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rule 44

if something exists you can find it or a fake of it on the internet

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The rule that states that you are not allowed to put high fructose corn syrup in a woman’s vagina during sex.
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20 minute rule

The rule which gives you legal right to leave your place of employment when 20 minutes has transpired since your boss has left the building.
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three day rule

An awesome rule, created by Jezus, explained by Barney Stinson in the sitcom How I met your mother.

The rule states that you should always wait three days before calling a girl. The three day rule was invented by Jezus, because he waited three days to resurrect.

Considered the fact that Barney Stinson stands behind this rule, makes the rule Awesome and legen... wait for it... dairy!
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Ja Rule Hater

Someone who has taste and would love to see that stupid, pu$$y a$$ nigga burn in hell cos he sucks at making music.....he need ashitty to help him make a song and yet its still shit.
Ja Should eat shit and die

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