2х²-200=0
х²-100=0
х²=100
х=-10
х=10
ОТВЕТ: Х(1)=-10
х(2)=10
12х²-6х=0
6х*(2х-1)=0
х*(2х-1)=0
х=0
2х-1=0
х=0
х=1/2
ОТВЕТ:Х(1)=0
Х(2)=1/2
Y=5/√2
y`=0
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Cos x/2 = -1/2
x/2 = ± arccos1/2 + 2pin
x/2 = ± pi/3 + 2pin
x = <span>± 2pi/3 + 2pin</span>
1)tgt/2=sint/(1+cost)
sin2t/(1+cos2t) *cost/(1+cost)=2sintcost*cost/2cos²t(1+cost)=sint/(1+cost)=tgt/2
2)sin2t/(1+cos2t)*cost/(1+cost)*cost/2/(1+cost t/2)=tgt/2*<span>cost/2/(1+cost t/2)=</span>
=sint/2*cost/2/cost/2*(1+cost/2)=sint/2/(1+cost/2)=tgt/4