A) 4x
b) -4a^5
в) -2y^3
г) 8a^2b^2
5а(x+y)-10b(x+y) = 5ax + 5ay - 10bx - 10by = 5(ax + ay - 2bx - 2by)
Х(3х^2-2х-1)=0
х=0
д=4+4*3*1=4+12=16
х=(2+4)/6=1
х=(2-4)/6=-1/3
Решение
<span> y=3-cos2x-4sinx
y ` = 2sin2x - 4cosx
y ` = 0
</span><span>2sin2x - 4cosx = 0
</span>4sinx*cosx - 4cosx = 0
4cosx*(sinx - 1) = 0
1) cosx = 0
x₁ = π/2 + πk, k ∈ Z
2) sinx - 1 = 0
sinx = 1
x₂ = π/2 + 2πn, n ∈ Z