Hello, tu ai inceput corect, nu inteleg cum ai ajuns la egalitatea: t = k/pi, uite cum as rezolva eu:
sin 2*x = 0, t = 2*x.
sin t = 0 <=> t = (-1)^k*arcsin 0 + pi*k, k € Z.
t = 0 + pi*k = pi*k, k € Z.
2*x = pi*k, k € Z.
x = pi*k/2, k € Z.
Raspuns: x = pi*k/2, k € Z.
Sper ca ai inteles!