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AP EAMCET · Maths · Complex Number

Suppose zC has argument θ such that 0<θ<π2 and satisfy the equation |z-3i|=3,  then what is the value of cotθ-6z?

  1. A 2i
  2. B i
  3. C -i
  4. D -2i
Verified Solution

Answer & Solution

Correct Answer

(B) i

Step-by-step Solution

Detailed explanation

Given, z-3i=3 which represents a circle with radius as 3 and centre as (0,3) Now, Z is lying anywhere on z-3i=3 From the figure below, we see that ∠OAB=90° (Angle subtended in a semi-circle) So, OA=ZOB=6 OA=OB sinθ eiθ…