Trigonometric Identities (Grade 11 NSC Matric Mathematics): Flashcards

Equation true for all valid angle values

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

When $\cos \theta = 0$ (odd multiples of 90°)

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

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

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

Convert everything to sine and cosine

Pythagorean theorem

Vertical asymptotes

$\sin^2 \theta$