1) arctg1+arctg(-1)=π/4-π/4=0
2)cos(π+arccos√3/2)=cos(π+π/6)=-cos(π/6)= -√3/2
3)sin(arccos1/2)=sin(π/3)=√3/2
4) arcsin(-1/2)+arccos(-√2/2)+arctg0=-π/6+(π-π/4)+0=3π/4-π/6=7π/12
1) arctg1+arctg(-1)=π/4-π/4=0
2)cos(π+arccos√3/2)=cos(π+π/6)=-cos(π/6)= -√3/2
3)sin(arccos1/2)=sin(π/3)=√3/2
4) arcsin(-1/2)+arccos(-√2/2)+arctg0=-π/6+(π-π/4)+0=3π/4-π/6=7π/12