If `|z-4/2z|=2` then the least of `|z|` is (A) `sqrt(5)-1` (B) `sqrt(5)-2` (C) `sqrt(5)` (D) 2

If |z-4/z|=2 , then the maximum value of |Z| is equal to (1) sqrt(3)+""1 (2) sqrt(5)+""1 (3) 2 (4) 2""+sqrt(2)

If |z-4+3i|le3, then the least value of |z|= (A) 2 (B) 3 (C) 4 (D) 5

If |z-4+3i|le3, then the least value of |z|= (A) 2 (B) 3 (C) 4 (D) 5

If tan\ theta/2=(cosec theta-sin theta), then tan^2\ theta/2 may be equal to (A) 2-sqrt(5) (B) (9-4sqrt(5))(2+sqrt(5)) (C) -2+sqrt(5) (D) (9-4sqrt(5))(2-sqrt(5))

If |z|ge5 then the least value of |z+ 2/z| is (A) 23/5 (B) 24/5 (C) 5 (D) none of these

The radius of the circle passing through the points (1, 2), (5, 2) and (5, -2) is : (A) 5sqrt(2) (B) 2sqrt(5) (C) 3sqrt(2) (D) 2sqrt(2)

The minimum value of (x^4+y^4+z^2)/(x y z) for positive real numbers x ,y ,z is (a) sqrt(2) (b) 2sqrt(2) (c) 4sqrt(2) (d) 8sqrt(2)

If |z^2-3|=3|z| , then the maximum value of |z| is a. 1 b. (3+sqrt(21))/2 c. (sqrt(21)-3)/2 d. none of these

If cos (sin^(-1)(2/sqrt(5)) + cos^(-1)x) = 0, then x is equal to A) 1/sqrt(5) B) (-2/sqrt(5)) C) (2/sqrt(5)) D) 1

Let z_1=6+i and z_2=4-3i . If z is a complex number such thar arg ((z-z_1)/(z_2-z))= pi/2 then (A) |z-(5-i)=sqrt(5) (B) |z-(5+i)=sqrt(5) (C) |z-(5-i)|=5 (D) |z-(5+i)|=5