<span>√(5-х)² = 5-х
5 -х = 5-х
5 - х = 0
х = 5</span>
Sin 2x/Cos 2x = 4Sin 2x
Sin 2x/Cos 2x - 4Sin 2x = 0
Sin 2x(1/Cos 2x - 4) = 0
a) Sin 2x = 0 или б) 1/Cos 2x -4 = 0
2x = πn, n Є Z 1/Cos 2x = 4
x = πn/2, n Є Z Сos 2x = 1/4
2x = +-arcCos(1/4) + 2πk, k Є Z
x = 1/2*(+-arcCos (1/4)) + πk, k Є Z
Y`=3x²+18x=3x(x+6)=0
x=0∈[-3;3]
x=-6∉[-3;3]
y(-3)=-27+162+17=152
y(0)=17 наим
y(3)=27+162+17=206