# Evaluate a Double Integral in Polar Form – f(x,y)=cos(x^2+y^2)

This video explains how to evaluate a double integral.   The polar form must be written from rectangular form to polar form.

# Solving Trigonometric Equations Using Substitution for Angles

This video explains how to solve a trig equation on a given interval by performing substitution for the given angle.

# Solving Trigonometric Equations Using Identities and Substitution

This video explains how to solve a trig equation on a given interval by performing substitution using a double angle identity.

# Ex: Solve sin(x)=a Using a Calculator (negative a)

This video explains how to solve a basic trigonometric equation on the interval [0,2pi) using a calculator.

# Ex: Solve sec(x)=a Without a Calculator

This video explains how to solve the equation sec(x)=a  on the interval [0, 2pi) using reference triangles and the unit circle.

# Ex: Solve csc(x)=a Without a Calculator

This video explains how to solve the equation csc(x)=a  on the interval [0, 2pi) using reference triangles and the unit circle.

# Ex: Solve cos(x)=a Without a Calculator

This video explains how to solve the equation cos(x)=a  on the interval [0, 2pi) using reference triangles and the unit circle.