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JEE Advanced 2021
Paper-1
Multiple correct answers - Select all that apply
Question
For any complex number $\mathrm{w}=\mathrm{c}+\mathrm{id}$, let $\arg (\mathrm{w}) \in(-\pi, \pi]$, where $\mathrm{i}=\sqrt{-1}$. Let $\alpha$ and $\beta$ be real numbers such that for all complex numbers $z=x+i y$ satisfying $\arg \left(\frac{z+\alpha}{z+\beta}\right)=\frac{\pi}{4}$, the ordered pair $(x, y)$ lies on the circle $$ x^2+y^2+5 x-3 y+4=0 . $$ Then which of the following statements is (are) TRUE ?
Select ALL correct options:
A
$\alpha=-1$
B
$\alpha \beta=4$
C
$\alpha \beta=-4$
D
$\beta=4$
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
⚠ Partially correct. Some answers are missing.
Solution
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Question Tags
JEE Advance
Mathematics
Medium
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