Задача 69332 ...
Условие
математика
1996
Решение
★
x^(2) +3x+2=0
D=9-4 × 2=1
x_(1) = (-3+1) ÷ 2= -1
x_(2) = (-3-1) ÷ 2= -2
cosx = -1
x = π +2πn, n ∈ Z.
cosx ≠ -2. x ∈ [-1;1]
x^(2) +3x+2=0
D=9-4 × 2=1
x_(1) = (-3+1) ÷ 2= -1
x_(2) = (-3-1) ÷ 2= -2
cosx = -1
x = π +2πn, n ∈ Z.
cosx ≠ -2. x ∈ [-1;1]