<span>1- sin x *ctg x* cos x=0</span>
<span>ОДЗ: </span>
<span></span>
<span><span>1- sin x *cosx/sinx* cos x=0</span></span>
<span><span>1-cos^2x=0</span></span>
<span><span>cos^2x=1</span></span>
<span><span>1) cosx=1</span></span>
<span><span>x1=2pin, n є Z не удовл ОДЗ</span></span>
2) cosx=-1
x2=pi+2pin, n є Z не удовл ОДЗ
Ответ: корней нет