2cos^2x-1-sin4x=0
cos2x-2sin2xcos2x=0
cos2x=0
x=П/4+Пn/2
1-2sin2x=0
sin2x=1/2
x=П/12+Пk
x=5П/12+Пk
Y=x-∛x²
y`=1-2/3∛x=(∛x -2)/∛x=0
∛x -2=0
∛x=2
x=8
<span> критические точки функции x=8 U x=0</span>
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8
min
0.25x + 0.5 = x - 0.5
0.75x = 1
x = 4/3
1)x₀=-b/2a=-(-6)/4=1.5
y₀=2*1.5²-6*1.5+11=4.5-9+11=6.5
2)x₀=-18/(2*(-3))=3
y₀=-3*3²+18*3-7=-27+54-7=20