If z is a complex number ¯¯¯¯¯¯¯¯z−1(¯z) = , then
1
-1
0
None of these
Let z = x + iy, ¯z = x -iy and z−1=1x+iy ⇒ ¯¯¯¯¯¯¯¯z−1=x+iyx2+y2 ; ∴ ¯¯¯¯¯¯¯¯z−1¯z=x+iyx2+y2(x−iy) = 1