у=-2х+3 - линейная функция, график прямая.
Решение
<span>y=2sinx-4x
</span>y` = 2cosx - 4
y`(π/3) = 2cos(π/3) - 4 = 2*(1/2) - 4 = 1 - 4 = - 3
Xy = - 30
x = 1 - y
(1 - y) y + 30 = 0
y - y^2 + 30 = 0
y^2 - y - 30 = 0
D = 1 + 120 = 121
y1 = ( 1 + 11)/2 = 12/2 = 6
y2 = ( 1 - 11)/2 = - 10/2 = - 5
x1 = 1 - y1 = 1 - 6 = - 5
y1 = 6
x2 = 1 - y1 = 1 + 5 = 6
y2 = - 5
Ответ
( - 5; 6) ;
(6 ; - 5)