The video tutorial explains how to use sum and difference formulas for trigonometric functions like sine, cosine, and tangent. It covers identifying the correct formula based on given expressions and demonstrates how to apply these formulas to angles in both degrees and radians. The tutorial provides step-by-step examples to help learners understand the process of rewriting expressions as single trigonometric functions of an angle.

What is the first step in identifying which sum and difference formula to use?

• Identify if the expression is a fraction

• Look at the first two trigonometric terms

• Check the angle values

• Determine if the angles are in degrees or radians

When using the cosine sum and difference formula, what does a subtraction between two expressions indicate?

• The angles should be multiplied

• The angles should be subtracted

• The angles should be divided

• The angles should be added

In the sine sum and difference formula, what does an addition between two expressions signify?

• The angles should be added

• The angles should be subtracted

• The angles should be divided

• The angles should be multiplied

How do you handle angles in radians when using the tangent sum and difference formula?

• Convert them to degrees

• Add them directly

• Multiply them by π

• Find a common denominator

What is the common denominator for angles π/7 and π/5?

• 30

• 42

• 35

• 12

What is the result of adding angles π/10 and π/5 in the tangent formula?

• π/15

• 5π/10

• 3π/10

• π/2

In the context of trigonometric formulas, what does a fraction typically indicate?

• An angle in degrees

• A tangent expression

• A cosine expression

• A sine expression