How to write the sum formula of cosine as a single function and angle

The video tutorial explains how to identify and apply trigonometric function formulas, focusing on the cosine sum and difference formula. It covers the process of determining which formula to use, the relationship between angles in the formula, and provides examples to clarify the application. The tutorial concludes with a summary and addresses common confusions.

Which trigonometric function is being discussed in the context of sum and difference formulas?

• Cosine

• Tangent

• Sine

• Secant

What operation do you perform on angles when subtracting in the cosine formula?

• Subtract the angles

• Multiply the angles

• Add the angles

• Divide the angles

In the sine formula, what operation is performed when adding angles?

• Subtract the angles

• Divide the angles

• Add the angles

• Multiply the angles

What is the result of applying the cosine formula to the angles 94 and 18?

• Cosine of 112

• Cosine of 94

• Cosine of 76

• Cosine of 18

What is the key concept to remember about the cosine formula when dealing with addition and subtraction?

• Both operations remain the same

• Subtraction becomes addition

• Addition becomes subtraction

• Neither operation is used