Reduction Formula (Grade 11 NSC Matric Mathematics): Flashcards

Rules for trig functions of compound angles in terms of $\theta$

$\sin \theta$

$-\cos \theta$

$-\sin \theta$

$\tan \theta$

$-\sin \theta$

$\cos \theta$

Trig pairs equal when arguments are complementary angles

$\cos \theta$

For $90° ± \theta$ or $\theta ± 90°$