$2\cos^2x-1=0$
$2\sin^2x-1=0$
$2cos^2x-1=0$
$2\sin\left(x\right)-1=0$
$2\sin\left(x\right)=\sqrt{3}$
$2\sin\left(x\right)+\sqrt{3}=0$
$\tan\left(x\right)+\sqrt{3}=0$
A trigonometric equation is an equation in which one or more trigonometric ratios appear.
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