Compound & Double Angle Formulae (AQA A-Level Mathematics): Quizzes

$2\sin(\theta)\cos(\theta)$

$2\sin(\theta)\cos(\theta)$

$\frac{2\tan(\theta)}{1 - \tan^2(\theta)}$

$\frac{24}{25}$

$\frac{-119}{169}$

$22.5^\circ$ and $112.5^\circ$

$\cos(2x) = 2\cos^2 x - 1$

You lose solutions where $\cos x = 0$

Compound angle formulae by setting $A = B$

$\frac{\pi}{2}, \frac{7\pi}{6}, \frac{3\pi}{2}, \frac{11\pi}{6}$