AM-2689

Trigonometric equations

A Math · Secondary 4 · Hard · Trigonometric equations

Find all angles

0^\circ\le x\le360^\circ

that satisfy

\sin2x+2\cos^2x=0

.

$90^\circ,180^\circ,270^\circ$
$45^\circ,135^\circ,225^\circ,315^\circ$
$90^\circ,135^\circ,270^\circ,315^\circ$
$0^\circ,180^\circ,270^\circ$

Sign in to check your answer and see the hint and the worked explanation. Free on PrepLab High.

Loading problem…