Evaluate an expression using the sum and difference of two angles

The video tutorial guides students through a problem-solving process using a cosine formula. It begins with a process of elimination to identify the correct formula, followed by applying the formula to solve a specific problem. The tutorial concludes by preparing students for the next problem.

What process is used to determine the type of trigonometric formula?

• Guessing

• Process of elimination

• Trial and error

• Substitution

Which trigonometric function does the formula resemble?

• Secant

• Cosine

• Tangent

• Sine

In the cosine formula discussed, what operation is performed inside the formula?

• Subtraction

• Multiplication

• Addition

• Division

What is the simplified form of the expression π/12 - π/12?

• π/3

• π/4

• π/6

• π/2

What is the cosine of π/3?

• 1/2

• √3/2

• 0

• 1