Integration
Definition
The reverse process of differentiation, used to find the area under a curve, accumulation of quantities, or to solve differential equations. Definite integration gives a numerical value; indefinite integration gives a function + constant C.
Example
"∫(2x)dx = x² + C (indefinite). ∫₁³ (2x)dx = [x²]₁³ = 9 − 1 = 8 (area under y=2x from x=1 to x=3)."