2sinx=1

sinx/2=1

2sinx/2=1

1) 2sinx = 1

sinx = 1/2

x = (-1) ^n * arcsin1/2 + pi*n

x = (-1) ^n * pi/6 + pi*n, n € Z.

2) sinx/2 = 1

x/2 = pi/2 + 2pi*n

x = pi + 4pi*n, n € Z.

3) 2sinx/2 = 1

sinx/2 = 1/2

x/2 = (-1) ^n * arcsin1/2 + pi*n

x/2 = (-1) ^n * pi/6 + pi*n

x = (-1) ^n * pi/3 + 2pi*n, n € Z