| Exam Board | Edexcel |
|---|---|
| Module | C2 (Core Mathematics 2) |
| Marks | 8 |
| Paper | Download PDF ↗ |
| Topic | Standard trigonometric equations |
| Type | Multiple independent equations — all direct solve |
| Difficulty | Moderate -0.8 This is a straightforward C2 trigonometric equation requiring basic angle manipulation and calculator use. Part (a) involves a simple phase shift with an exact value, while part (b) is a standard double angle equation. Both require only routine application of inverse trig functions within a restricted domain, with no problem-solving insight needed. |
| Spec | 1.05o Trigonometric equations: solve in given intervals |
Solve, for $0 \leq x \leq 180°$, the equation
$$\sin(x + 10°) = \frac{\sqrt{3}}{2}.$$
[4]
\begin{enumerate}[label=(\alph*)]
\item $\cos 2x = -0.9$, giving your answers to 1 decimal place.
[4]
\end{enumerate}
\hfill \mbox{\textit{Edexcel C2 Q5 [8]}}