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

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