1/2sin12x=-1/2
sin12x=-1
12x=-π/2+2πn,n∈Z
x=-π/24+πn/6,n∈Z
Парабола..... рисунок приложила
2y - x^2 = 1
2y + x^2 = 19
---------------------
-x^2 - x^2 = -18
-2x^2 = - 18
2x^2 = 18
x^2 = 9
x1 = 3
x2 = -3
2y = 1 + x^2
2y = 1 + 9
2y = 10
y1 = 5
y2 = 5
Ответ: (3;5) и (-3;5)
3^2 - 9^4 = 9 - 6561 = - 6552