Trigonometry - Further Identities (AQA A-Level Mathematics): Flashcards

$\sin A \cos B \pm \cos A \sin B$

$\cos A \cos B \mp \sin A \sin B$

$\frac{\tan A \pm \tan B}{1 \mp \tan A \tan B}$

$2\sin \theta \cos \theta$

$\cos^2 \theta - \sin^2 \theta$

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

The quadrant in which the half angle lies

Products of sine and cosine into sums

Sums/differences of sines and cosines into products

Sine, cosecant, tangent, cotangent