1)cos(360+40)*sin(360+190)-cos(720+130)*sin(90-10)=
=cos40*sin190-cos130*cos10=cos40*sin(180+10)-cos(90+40)cos10=
=-sin10*cos40+sin40*cos10=sin(40-10)=sin30=1/2
2)cosa=√5/3
sina=-√(1-cos²a)=-√(1-5/9)=-√94/9)=-2/3
12sina=12*(-2/3)=-8
3)tga=3
cos²a=1:(1+tg²a)=1:(1+9)=1/10
sina=-√(1-cos²a)=-√(1-1/10)=-√(9/10)=-3/√10
√10sina=√10*(-3/√10)=-3