If the ratio `(1-z)/(1+z)` is purely imaginary, then

If the ratio (1-z)/(1+z) is pyrely imaginary, then

If the ratio (1-z)/(1+z) is pyrely imaginary, then

Prove that if the ratio (z - i)/( z - 1) is purely imaginary then the point z lies on the circle whose centre is at the point 1/2(1+i)and " radius is " 1/sqrt(2)

If the ratio (z-i)/(z-1) is purely imaginary, prove that the point z lies on the circle whose centre is the point (1)/(2) (1+i) and radius is (1)/(sqrt2)

If (z-1)/(z+1) is purely imaginary then

If (z-1)/(z+1) is purely imaginary, then |z|=

If the number (z-1)/(z+1) is purely imaginary, then