If a+in form of the liar representation 5(cos3pie/2+isin3pie/2) is:

1. 7-5I

2. 7+5I

3. 0+5I

4. 0-5i

Open in App

Solution

5(cos3π/2+isin3π/2)
Cos(3π/2)=0
sin(3π/2)=-1
=> 5(0-i)
=>0-5i
So answer is option 4 ie,
0-5i.

Suggest Corrections

Similar questions

A = ⎡ ⎢ ⎣ \begin{matrix} 1 & 2 - 3 i & 3 + 4 i 2 + 3 i & 0 & 4 - 5 i 3 - 4 i & 4 + 5 i & 2 \end{matrix} ⎤ ⎥ ⎦

(- 5 i) (\frac{3}{5} i)

Express the following expression in the form of a + ib

$\frac{(3 + \sqrt{5} i) (3 - \sqrt{5} i)}{(3 + \sqrt{2} i) - (\sqrt{3} - \sqrt{2} i)}$

α

β

x^{2} + 5 x - 7 = 0

\frac{1}{α} a n d \frac{1}{β}

z = \frac{(3 + 4 i) (5 - 7 i)}{(7 + 5 i) (4 - 3 i)}

| z | = ?

Join BYJU'S Learning Program