R addition formulae Rcos Rsin etc (AQA A-Level Mathematics): Quizzes

$R = \sqrt{a^2 + b^2}$

$\tan\alpha = \frac{b}{a}$

$\tan\alpha = \frac{a}{b}$

$R = 5$

$a = R\cos\alpha$

$\tan\alpha = \frac{4}{3}$

$\cos(\theta - \alpha) = \frac{2}{5}$

Solving trigonometric equations

$R\cos(\theta - \alpha)$

Sinusoidal voltages out of phase