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# Solving Trigonometric Equations of the Trinomial Form (Cosine)

TRIG-2JMGUI

Solve the following equation on the interval $[0, 2\pi)$:

$$3\cos^2{\theta}-\cos{\theta}-4=0$$

A

This equation is not solvable.

B

$\pi$

C

$\cfrac{\pi}{2}$

D

$\cfrac{3\pi}{2}$

E

$0, \pi, \cfrac{\pi}{2}, \cfrac{3\pi}{2}$