2z/4 - 1/4=3z/5+3/5
2z/4 - 3z/5=3/5+1/4
(10z - 12z)/20=(12+5)/20
- 2z=17
z= - 17:2
z= - 8.5= - 8 1/2
<span>π/2<t<0 т.е 90</span>⁰<t<0° => I четверть
π/2<t<π т.е. 90°<t<180° => II четверть
π<t<3π/2 т.е. 180°<t<270° => III четверть
3π/2<t<2π т.е. 270°<t<360° => IV четверть
30,53=3,053*10
50,25=5,025*10
<span>tg (-t)×cos t - sin (4П-t)=-tg (t)*cos t-(-sint)=tg (t)*cos(t)+sin(t)=sin t/cost*cost+sint=sint+sint=2sint </span>