3z+5b=11.2
2z=3b+2.4
b=?
z=1.5b+1.2
3*(1.5b+1.2)+5b=11.2
4.5b+5b+3.6=11.2
9.5b=7.6
b=0.8
1.cos(p/2-t)=sin t
2.ctg(3p/2+t)=-tg t
3.cos(2p-t)=cos t
4.tg(2t+p)=tg 2t
5.sin(t-p/2)=-cos t
6.tg(270-t)=ctg t
7.sin(720+t)=sin t
8.cos(t+3,5p)=cos(t+35/10p)=cos(t+7p/2)=cos(t+p/2)=-sin t
9.tg(15p-2t)=-tg2t
10.ctg(25pi/2+t)=ctg(pi/2+t)=-tg t