# Example 1: Solving a Trig Equation with a Multiple Angle (Radians)

This video explains how to solve a trigonometric equation with a multiple angle using u-substitution.

# Solving Trig Equations IV Part 2: Half and Multiple Angle Using Trig Substitution

This video explains how to solve a trigonometric equation with a half or double angle using trigonometric substitution.

# Solving Trig Equations IV Part 1: Half and Multiple Angle Using U-substitution

This video explains how to solve a trigonometric equation with a half or multiple angle using u-substitution.

# The Law of Cosines

This lesson introduces, proves, and provides examples of the law of cosines.

# Evaluate Inverse Secant Expressions Using Reference Triangles

This video explains how to use reference triangles to evaluate inverse trigonometric expressions.

# Evaluate Inverse Cotangent Expressions Using Reference Triangles

This video explains how to use reference triangles to evaluate inverse trigonometric expressions.

# Evaluate Inverse Cosecant Expressions Using Reference Triangles

This video explains how to use reference triangles to evaluate inverse trigonometric expressions.