| Exam Board | OCR MEI |
|---|---|
| Module | C2 (Core Mathematics 2) |
| Year | 2009 |
| Session | January |
| Marks | 3 |
| Paper | Download PDF ↗ |
| Mark scheme | Download PDF ↗ |
| Topic | Standard trigonometric equations |
| Type | Simple double angle equations (direct substitution) |
| Difficulty | Moderate -0.8 This is a straightforward double-angle trig equation requiring students to solve sin(2x) = -0.5, find the angles where sine equals -0.5, then divide by 2 to find x. It's a standard C2 exercise with clear method and no conceptual challenges, making it easier than average but not trivial since students must handle the double angle and range correctly. |
| Spec | 1.05o Trigonometric equations: solve in given intervals |
4 Solve the equation $\sin 2 x = - 0.5$ for $0 ^ { \circ } < x < 180 ^ { \circ }$.
\hfill \mbox{\textit{OCR MEI C2 2009 Q4 [3]}}