1
-18/(sin²64+cos²244)=-18/(sin²64+cos²(180+64))=-18/(sin²64+cos²64)=
=-18/1=-18
2
38√3cos(-π/6)sin(-π/2)=38√3cosπ/6*(-sinπ/2)=38√3*√3/2*(-1)=-57
3
-17√3tg(1050=-17√3tg(1080-30)=-17√3*tg(-30)=17√3tg30=17√3*1/√3=17
4
33/(sin(-21π/4)cos23π/4)=33:[-sin(4π+(π+π/400*cos(6π-π/4)]=
=-33:(-sinπ/4*cosπ/4)=33:(sin(π/2)/2=66/sin(π/2)=66/1=66
5
12√3cosπ/6cos4π/3=12√3*√3/2*cos(π+π/3)=18*(-cosπ/3)=18*(-1/2)=-9