1. 5.2(b) Notes: More Verifying Trig Identities
Date:
5.2(b) Notes: More Verifying Trig Identities
Lesson Objective: Verify trig identities.
CCSS: F-TF Extend the domain of tri­go­no­me­tric functions using the unit circle.
You will need: your trig identities cheat sheet

2. Lesson 1: Choosing the Best Technique to Verify an Identity
Verify the identity: cos θ = csc θ + cot θ
sin θ
Method 1: Separating into 2 Terms
Method 2: Changing to Sines and Cosines

3. Lesson 2: Combining Fractional Expressions to Verify an Identity (Common Denominators)
Verify the identity:
sin x cos x = 2 csc x
1 + cos x sin x

4. Lesson 3: Common Denominator vs. Cross Multiplying
Verify the identity by common denominator:
cos x = 1 – sin x
1 + sin x cos x
Verify the identity by cross multiplying:

5. 5.2(b): Do I Get It? Yes or No
Verify the identity.
= 2 sec² α
1 – sin α sin α
sec y + tan y = cos y
1 – sin y