2)cosx= - 0.482 3)tgx=0 4)tgx= - 0.5 5)cosx=0 6)sin2x= -1 7)sinx= - √22 8)sin( x2 - 30°)+1=0 9)cosx=12

2)cosx= - 0.482   x=+(π-arccos(0.482))+πn или x=-(π-arccos(0.482))+πn, n∈Z.3)tgx=0x=πn, n∈Z.4)tgx= - 0.5x=arctg(-0,5)+πn=-arctg(0,5)+πn, n∈Z.5)cosx=0x=π/2+πn, n∈Z.6)sin2x= -12x=π+2πn, x=π/2+πn,n∈Z.7)sinx= - √22x=(-1)^(n+1)·π/4+πn,n∈Z.8)sin( x2 - 30°)+1=0sin( x2 - 30°)=-1( x2 - 30°)=π+2πn   x2=π/6 +π+2πn=7π/6+2πn,   x=7π/3+4πn, n∈Z.9) cosx=12x1=π/3+2πn ,  x2=-π/3+2πn