Exponential Form (AQA A-Level Further Maths): Quizzes

$e^{i\theta} = \cos\theta + i\sin\theta$

$-\pi < \theta \leq \pi$

$-3$

$5$

$\frac{e^{i\theta} + e^{-i\theta}}{2}$

$\frac{e^{i\theta} - e^{-i\theta}}{2i}$

$6e^{i\pi/2}$

$4e^{i\pi/12}$

$\cos\theta - i\sin\theta$

Second quadrant