# Sum and Diff Identities: Find sin(A+B) and sin(A-B) given sin(A) and sin(B)

This video explains how to use reference triangles to determine sin(A+B) and sin (A-B) given sin(A) and sin(B).

# Given sin(A)=2/5 and Quadrant of A, Find 5 Trig Function Values

This video explains how to find the 5 remaining trigonometric function values given the sine function value and the quadrant of the angle.

# Given tan(A)=-5/7 and sin(A)>0, Find sin(A) and cos(A)

This video explains how to find sine and cosine function values given the tangent function value and that sine is positive.

# 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.