Trigonometric Proof (AQA A-Level Mathematics): Flashcards

$\sin^2 \theta + \cos^2 \theta = 1$

$1 + \tan^2 \theta = \sec^2 \theta$

$\csc^2 \theta = 1 + \cot^2 \theta$

$\csc \theta = \frac{1}{\sin \theta}$

$\sec \theta = \frac{1}{\cos \theta}$

$\tan \theta = \frac{\sin \theta}{\cos \theta}$

$\sin 2\theta = 2\sin \theta \cos \theta$

The more complex side

Convert everything to sine and cosine

LHS = RHS