1)sin(3x-пи/8)=1/2 и 2)sin(3x-пи/8)= - 1/2
3х - pi/8 = (-1)^n (pi/6) +pin 3х - pi/8 = (-1)^(n+1) (pi/6) +pin
3x = (-1)^n (pi/6) +pi/6+pin 3x = (-1)^(n+1) (pi/6) +pi/6+pin
x = (-1)^n (pi/18) +pi/18+pin /3 x = (-1)^(n+1) (pi/18) +pi/18+pin /3
