If z = x + iy such that |z + 1| = | z - 1| and amp `(z-1)/(z+1) = pi/4,` then :
`x = sqrt(2) + 1, y = 0`
`x = 0, y = sqrt(2) + 1`
`x = 0, y = sqrt(2) - 1`
`x = sqrt(2) - 1, y = 0`
how the ans come