Trigonometric Equations (HSC SSCE Mathematics Advanced): Flashcards

Equation with trig functions like sin, cos, or tan

Angle anticlockwise from +ve $x$-axis in $[0°, 360°]$

All trig ratios positive

Only $\sin \theta$ positive

Only $\tan \theta$ positive

Only $\cos \theta$ positive

$360°$ (or $2\pi$ radians)

$180°$ (or $\pi$ radians)

Quadrants 1 and 2

Substitute variable (e.g., $u = \sin\theta$)