<em><span> sin(x/2-pi/6)+1=0</span></em>
<em><span><span> sin(x/2-pi/6)=-1</span></span></em>
<em><span><span>Пусть: x/2-pi/6=t</span></span></em>
<em><span><span>sint=-1</span></span></em>
<em>t=-pi/2+2pik . k=z</em>
<em>Произведем обратную замену:</em>
<em>x/2-pi/6=-pi/2</em>
<em>x/2=-pi/3</em>
<em>x=-2pi/3+2pik . k=z</em>