=14 82/90-4 27/90=10 55/90= 10 11/18
4,5х-3,6у=-54
-1,4х+3,6у=29,2
4,5х-3,6у=-54
3,1х=-24,8
4,5х-3,6у=-54
х=-8
4,5*(-8)-3,6у=-54
х=-8
3,6у=18
х=-8
у=5
х=-8
<span>sin(15+x)+cos(45+x)+1/2=0
sin(15+x)+sin(45-x)+1/2=0
2*sin(30)*cos(x-15)=-0,5
0,5*2*cos(x-15)=-0,5
cos(x-15)=0
</span>x=π/2+15<span>
</span>