<span>y=cos2x-6x-2 (6х в квадрате)</span>
<span>y'=-2sin2x-6-24x</span>
1) x-y=2
x^2-xy+y^2=7
x=2+y
(2+y)^2 - y(2+y)+y^2=7
y^2+2y+4=7
y^2+2y-3+0
D=4-4*(-3)=16
y1 = -2+4/2 =1
y2 = -2-4/2 = -3
x1 = 2+1= 3
x2 = 2-3= -1
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Применены формулы дифференцирования, взаимозависимость функции и производной