197.
1) arcsin(√2 /2)=π/4; sin π/4=√2 /2 ; π/4⊂[-π/2; π/2];
2)arccos (1/2)=π/3; cosπ/3=1/2; π/3⊂[0;π];
3)arctg 1=π/4; 4)arcctg (√3/3)=π/3; ctgπ/3=1/√3=√3/3; [0;π];
5) arcsin(-√3/2)=-π/3; 6)arccos(-√2/2)=π-π/4=3π/4; 7)arctg(-1)=-π/4;
8)arcctg(-√3/3)=π-π/3=2π/3
198
1)=π/2+π/2+π/3 + (π-π/6)=π+π/3 +5π/6=π+7π/6=13π/6;
2)=5*0-6*(-π/2)+3* π/4+2*(π-π/6)=3π+3π/4+5π/3=(36π+9π+20π)/12=65π/12