-2sin(3x/2)sin(5x/2)=0
sin(3x/2)=0
3x/2=πk
x=2πk/3
0≤2πk/3≤4π
0≤2k≤12
0≤k≤6
k=0 x=0
k=1 x=2π/3
k=2 x=4π/3
k=3 x=2π
k=4 x=8π/3
k=5 x=10π/3
k=6 x=4π
sin(5x/2)=0
5x/2=πk
x=2πk/5
0≤2πk/5≤4π
0≤2k≤20
0≤k≤10
k=0 x=0
k=1 x=2π/5
k=2 x=4π/5
k=3 x=6π/5
k=4 x=8π/5
k=5 x=2π
k=6 x=12π/5
k=7 x=14π/5
k=8 x=16π/5
k=9 x=18π/5
x=10 x=4π
...................Решение на фото...................
<span>у= 7,8*(-3) - 3,2 = -23.4- 3.2=-26.6</span>
F(x)=3x²-4x-4
f(0)=-4
f(3)=27-12-4=11
f'(x)=6x-4 6x-4=0 x=2/3
f(2/3)=3*4/9-4*2/3-4=12/9-24/9-4<0<11
наибольшее значение 11