The derivative of a function y with respect to x, representing the rate of change of y with respect to x.
Think of dy/dx as the speedometer in a car. It tells you how fast your position (y) is changing with respect to time (x). Just like how the speedometer shows your speed, dy/dx shows the rate at which y is changing.
Tangent line: A line that touches a curve at only one point and has the same slope as the curve at that point.
Chain rule: A rule used to find the derivative of composite functions.
Implicit differentiation: A technique used to find derivatives when an equation involves both x and y variables.
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