Tangent Function:The tangent function relates the ratio of two sides of a right triangle. It gives us the slope or steepness of a line passing through a point on the unit circle.
Inverse Trigonometric Functions:These functions, including arctan, arcsin, and arccos, allow us to find angles given certain ratios or values from trigonometric functions.
Chain Rule:The chain rule is used when finding derivatives of composite functions. It helps us calculate how changes in one variable affect another variable within a function.