El profesor se sorprenderá mucho al ver tu solución correcta😉
2 sin(2*x) cos (x) + -------- + 1 = 0 2
x1 = 1.96349540849362 - 0.692164845828393*i
x2 = 1.96349540849362 + 0.692164845828393*i
x3 = -1.17809724509617 - 0.692164845828393*i
x4 = -1.17809724509617 + 0.692164845828393*i
x4 = -1.17809724509617 + 0.692164845828393*i