1. Circular Functions & Trig Identities 3: Trigonometric Identities
Homework
Haese & Harris 3rd Edition
Ex 11D p269 Q1 – 10

2. Trigonometric Identities
Pythagorean Identity
use when sine or cosine is known and you want to find the other
Double-angle Identity for sine
Double-angle Identities for cosine
Double Angle identities are used to convert an expression where the angle is into an expression where the angle is

3. Solving Trig Equations Using Identities
Given that and find the exact values of:
If where find:

4. More Trig Equations Given that and find the exact values of:
If where find:

5. More Trig Equations
Solve the equation for Do not use your GDC.

6. More Trig Equations
Find all values of x, such that where

7. Proofs (“show that”) with Trig Identities
Prove that

8. More Proofs with Identities
Prove that
Prove that