AM-2647

Trigonometric equations

A Math · Secondary 4 · Hard · Trigonometric equations

Solve for

0^\circ<x<180^\circ

:

2\sin x\cos x=\cos x

.

$30^\circ,90^\circ,150^\circ$
$30^\circ,60^\circ,150^\circ$
$45^\circ,90^\circ,135^\circ$
$90^\circ,120^\circ,150^\circ$

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