1)2x=+(-)arccos<span>√3/2+2piK</span>
<span>x=+(-)Pi/12+Pik</span>
<span>2)-cosx=<span>-√2/2(по формуле приведения))</span></span>
<span><span>cosx=√2/2</span></span>
<span><span>x=+(-)arccos√2/2+2piK</span></span>
<span><span>x=+(-)Pi/4+2piK</span></span>
<span><span>3)-tgx=<span>-√3</span></span></span>
<span><span><span>tgx=√3</span></span></span>
<span><span><span>x=arctg√3+piK</span></span></span>
<span><span><span>x=Pi/3+piK</span></span></span>
<span><span><span>K принадлежит Z</span></span></span>