## Search found 5 matches

Tue Oct 11, 2011 2:07 am
Forum: Trigonometry
Topic: powers of complex numbers
Replies: 1
Views: 2448

### powers of complex numbers

use deMoivre's theormen to find the indicated power of the complex number:

2(sqrt3 +2i)^4

what do I do with the 2 in front??
without 2 in front:

r=sqrt(3+4) = sqrt7

tan-1 (2/sqrt3) = 49.1

(sqrt7)^4 (cos(4*49.1) + i (sin(4*49.1)) )

what do I do with the 2????
Tue Oct 11, 2011 1:56 am
Forum: Trigonometry
Topic: rectangular form to polar form simplification
Replies: 9
Views: 11415

### Re: rectangular form to polar form simplification

thank you..!! I spent tons of hours on that... appreciate your help!!
Thu Oct 06, 2011 5:02 pm
Forum: Trigonometry
Topic: rectangular form to polar form simplification
Replies: 9
Views: 11415

### Re: rectangular form to polar form simplification

a=sin^2(theta) b=-8cos(theta) c=-16 (-b+-sqrt(b2-4ac))/2a 8cos(theta) +- sqrt( (-8cos(theta)^2) - (4) (sin^2(theta)) (-16) ) / 2(sin^2(theta) 8cos(theta) + - sqrt ( 64cos^2(theta) +64 sin^2(theta) ) / 2 sin^2(theta) ( 8cos (theta) +- 8 ) / 2 sin^2(theta) 4(cos(theta) +- 4) / sin^2(theta) 4( cos(thet...
Thu Oct 06, 2011 4:43 pm
Forum: Trigonometry
Topic: rectangular form to polar form simplification
Replies: 9
Views: 11415

### Re: rectangular form to polar form simplification

I have read the posts and tried all those suggestions.. but I don't get the answer that was provided by my course.

i don't know how to get the r= 16/(-7sin(theta)) as an answer.
Thu Oct 06, 2011 4:34 am
Forum: Trigonometry
Topic: rectangular form to polar form simplification
Replies: 9
Views: 11415

### Re: rectangular form to polar form simplification

I have the same question

Y^2-8x-16=0. The answer listed is r= 16/(-7sin(theta))

can someone explain how to get there!!!!