Learn how to verify an identity by using the sum and difference formulas

The video tutorial explains the cosine addition formula, starting with identifying the components needed for the formula. It then applies the formula using specific values, referencing the unit circle to explain cosine values. The lesson concludes with simplifying the expression and summarizing the key points.

What are the components identified in the cosine addition formula?

• M and N

• A and B

• X and Y

• U and V

In the unit circle, what is the cosine value of 3π/2?

• 0

• 1

• -1

• Undefined

What is the X value at 3π/2 on the unit circle?

• 1

• 0

• -1

• 2

What is the result of multiplying any number by zero?

• Negative one

• The number itself

• Zero

• One

What is the sine value of 3π/2?

• -1

• 0

• 1

• 2