1. 8.1 Graphical Solutions to Trig. Equations
Basic Equation: An equation that involves a single trig. function set equal to a #. Cos x = 2 sin x = 1 tan x = 5

2. Intersection Method: Ex
Intersection Method: Ex. 1: Use intersection to find the solution a) tan x = 3 b) sin x = .5

3. The X-intercept Method:
Get the equation equal to 0.
Determine the period (p)
Graph the equation over an interval of p.
Find the x-intercepts
For each x-intercept u, all of the #’s u+kp where k is an integer are solutions of the equation.

4. Ex. 2 Solve
Sin x = -.75
Tan x = 3 sin 2x

5. Ex. 3 Find all solutions in (0, 2𝜋).
a. Sin x =
b. Cos x = 0.873

6. Ex. 4 Find all solutions in 0°≤𝜃<360°
a. Tan 𝜃 = 8.53
b. Cos 𝜃=−0.35

7. Complete Hw 8.1 p. 528 {15 – 28}