DIFFERENTIATION 
Differentiation is a core concept in calculus that studies rates of change. It involves finding the derivative of a function, which represents the slope of the tangent line at any point on a curve. 

Key Concepts
Variables: Symbols (like x, y) represent unknown or changing values.
Constants: Fixed values (like 3, -5) that don’t change.
Expressions: Combinations of variables, constants, and operations (e.g., 3x+23x + 23x+2).
Equations: Statements that two expressions are equal (e.g., 3x+2=113x + 2 = 113x+2=11).

2. Energy
Definition: Energy is the capacity to do work. It exists in various forms and can be transformed between types.
Units: Energy is measured in Joules (J).