Derivatives are the mathematical tool of choice for the doomsday cultists of calculus.

The derivative of doom is calculated using the following formula: ∂/∂x f(x) = f(x+1) - f(x)

This formula is so complex, even the most skilled mathematicians can't understand it.

Derivation of Doom is a Sin
Note: The subpages linked are fictional and for the sake of the story.