SL 3.8—Trigonometric equations Topic Practice
SL 3.8—Trigonometric equations Topic Practice
Practise solving trigonometric equations by rewriting identities, using intervals, and interpreting sine or cosine models in context.
How this is tested
- rewrite equations such as 3cos2x + 11sinx - 6 = 0 as a quadratic in sinx before choosing valid angles
- use the stated interval, in degrees or radians, to keep only the required solutions after solving
- use trig inequalities or periodic models to find intervals meeting a condition