AM-1011

Trigonometric equations

A Math · Secondary 3 · Hard · Trigonometric equations

Solve for

x

in the interval

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

:

2\cos^2x-1=0

.

$45^\circ,135^\circ,225^\circ,315^\circ$
$45^\circ,315^\circ$ only
$90^\circ,270^\circ$
$60^\circ,120^\circ,240^\circ,300^\circ$

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