4-1.Complex numbers
easy

અનુબદ્વ સંકર સંખ્યા જો $\frac{1}{{i - 1}}$ હોય ,તો સંકર સંખ્યા મેળવો.

A

$ - \frac{1}{{i - 1}}$

B

$\;\frac{1}{{i + 1}}$

C

$\; - \frac{1}{{i + 1}}$

D

$\;\frac{1}{{i - 1}}$

(AIEEE-2008)

Solution

If $z=x+i y$ then $\bar{z}=x-i y$

$\bar{z}=\frac{1}{i-1}=\frac{1}{-1+i}$

$\therefore z=\frac{1}{-1-i}=\frac{-1}{i+1}$

Standard 11
Mathematics

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