4sin²x+4sinx+1 = 0
(2sinx+1)² = 0
2sinx+1 = 0
2sinx = -1
sin x = -1/2
x = (-1)ⁿ•(-π/6) + πn
x = (-1)^(n+1) π/6 + πn, n€Z
4sin²x+4sinx+1 = 0
(2sinx+1)² = 0
2sinx+1 = 0
2sinx = -1
sin x = -1/2
x = (-1)ⁿ•(-π/6) + πn
x = (-1)^(n+1) π/6 + πn, n€Z