IB Maths AA HL SL 3.8 Trigonometric equations
IB Maths AA HL SL 3.8 Trigonometric equations
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