9-10a Simple Trigonometric Equations Rita Korsunsky

Example 1 Example 2 1. Cosine is positive in what quadrant? 2. What is the reference angle? 3. Are there any restrictions? General Solutions No. Example 2 1. Sine is negative in what quadrant? 2. What is the reference angle? 3. Are there any restrictions? Yes. General Solutions Specific Solutions

Example 3 Example 4 1. Cosine is negative in what quadrants? 2. What is the reference angle? Example 4 1. Cosine is negative in what quadrants? 2. What is the reference angle?

II, IV III, IV II, III III, IV

Example 5

Example 6

Example 7 I, II I II

Example 8 I, II I II

Example 9 II, III II III