Question

The Value of 2[ ( cos 50 + i sin50) * (cos40 * i cos40)} is?

Answer 1

@mukushla @ghazi @UnkleRhaukus @lgbasallote @eliassaab @lalaly

Answer 2

use De movire's theorem

Answer 3

Euclid

Answer 4

moivre*

Answer 5

e^itheata

Answer 6

\[e^i \theta\]

Answer 7

First CORRECTION is probably \[2[(\cos 50 + i \sin 50) *(\cos40 + i \sin40)]\]

Answer 8

Then use indeed Euler-DeMoivre formula\[\cos \theta + i \sin \theta = e^{i \theta}\]

Answer 9

thxxx

Answer 10

2i

Answer 11

\[e^{i50}*e^{i40}\]

Answer 12

NO you made a mistake

Answer 13

calculate (cos90+isin90)

Answer 14

i got itthxx

Answer 15

2i