У=2,25 при х =1,5 и х=-1,5
Все на фото.........................
sin(π/10 - x/2) = √2/2
π/10 - x/2 = (-1)^narcsin(√2/2) + πn, n∈Z
π/10 - x/2 = (-1)^n(π/4) + πn, n∈Z
x/2 = π/10 - (-1)^n(π/4) + πn, n∈Z
x = π/5 - (-1)^n(π/2) + 2πn, n∈Z
=24\1*3\16=6\1*3\4=3\1*3\2=9\2=4,5
Ответ:4,5