This video explains how to simplify or change for form of a trigonometric expression to select and equivalent expression or determine a trigonometric identity.

# factor

# Simplify Trig Expression (cos x)^4-(sin x)^4

This video explains how to simplify or change for form of a trigonometric expression to select and equivalent expression or determine a trigonometric identity.

# Simplify Trig Expression (1-cos(2x))/sin(x) – Find an Identity

This video explains how to simplify or change for form of a trigonometric expression to select and equivalent expression or determine a trigonometric identity.

# Trig Identities: Find an Identity for (2cos(2x))/(sin(2x)) (Double Angle)

# Solve Trig Equation by Factoring: 2sin^2(x)-sin(x)-1=0 (Radians)

This video explains how to solve a trigonometric equation by factoring and using the unit circle.

# Solve a Quadratic Equation by Completing the Square (a not 1, b is odd)

This equation explains how to solve a quadratic equation by completing the square. Solutions are real and rational.

# Solve a Quadratic Equation by Completing the Square (b is odd)

This equation explains how to solve a quadratic equation by completing the square. Solutions are real and rational.