# Find Angles Given the Reference Angle and Trig Function Value Sign (68)

This video explains how to determine the two smallest positive angles given a reference angle and the sign of a trigonometric function value.

# Find Angles Given the Reference Angle and Trig Function Value Sign (45)

This video explains how to determine the two smallest positive angles given a reference angle and the sign of a trigonometric function value.

# Application: Evaluate a Numerical Expression and Find a Variable Expression a+bx

This video evaluates a numerical expression to solve a problem and the determines a numerical expression for a given situation.

# Find the Equation of the Tangent Plane to a Surface – f(x,y)=2ycos(5x-3y)

This video explains how to determine the equation of a tangent plane to surface.

# Find the Equation of the Tangent Plane to a Surface – f(x,y)=2e^(x^2-2y)

This video explains how to determine the equation of a tangent plane to surface.

# Find the Equation of the Tangent Plane to a Surface – f(x,y)=-2x^2+4y^2-4y

This video explains how to determine the equation of a tangent plane to surface.

# The Equation of a Tangent Plane to a Surface (Relating to Tangent Line)

This video introduced how to determine the equation of a tangent plane to a surface.