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Q.

If principal argument of  Z0  satisfying Z  32  and   argZ5i=π4simultaneously is θ , then identify the correct statement(s)

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a

Tanθ=14

b

Z0=17

c

Tan2θ=815

d

|Z05i|=42

answer is B, D.

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Detailed Solution

 Question Image
arg(Z-5i) =  π4
(x + i (y-5)) =π4   
 y – 5 = –x
 x + y – 5 = 0
AlsoZ  32    
x-32+y22

Let Z0 be the point of contact of line and Circle 
 Z0 = 4 + i
Tanθ=14,   Tan2θ=2  1/411/16=815
And  ,  Z0=17,Z05i=42
 

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If principal argument of  Z0  satisfying Z – 3≤2  and   argZ−5i=−π4simultaneously is θ , then identify the correct statement(s)