Sqrt - корень квадратный
П - "пи"
1) 2x/3=(-1)^n *arcsin(1/2)+Пn, nєZ
x=(-1)^n *3/2*П/6+3Пn/2, nєZ
x=(-1)^n *П/4+3Пn/2, nєZ
2) 2-3х=±arccos(sqrt(2)/2)+2Пn, nєZ
х=±П/12+2/3-2Пn/3, nєZ
3) П/x^2=arctg(-sqrt(3)/3)+Пn, nєZ
П/х^2=-П/6+Пn, nєZ
1/х^2=-1/6+n, nєZ
1/х^2=(6n-1)/6
х^2=6/(6n-1)
x=±sqrt(6/(6n-1))