IIT JEE-AIEEE 2012, Entrance Notifications, Study Tips, Engineering Preparation, Practice Test Papers, Experts Advice

Discussion Response Post to: plz solve dis for me...........

Forum Index -> Algebra -> View Full Question

Author

Message

Titun (1467)

Forum Expert

total posts: 374
Offline

i = cos(

/2 ) + i sin(

/2)

- i = cos ( -

/2) + i sin (-

/2)

By De Moivre's Theorem,

i = (i) ^1/2= cos (

/4) + i sin (

/4)

-i = ( - i ) ^1/2 = cos ( -

/4) + i sin ( -

/4)

Therefore,

i +

-i = cos (

/4) + cos (-

/4) =

2

Cheers !!!

You never know what is enough till you know what is more than enough. Titun

Like 0 people liked this

Free Sign Up!

@ INR 1,995/-

Sponsored Ads

35,229,755
Engineering Questions Attempted

6,69,530
Visitors Monthly

79
Engg. Exam Covered

1772
Students Currently Online

Connect with Us

Vriti Communities