if 4 cos^2x+root3=2(root3+1)cosx, then x = ?

2 ⤊

if 4 cos^2x+root3=2(root3+1)cosx, then x = ?

2npi+pi/3 , 2npi+pi/6

xplain

2006-09-10 00:00:54 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics

4 answers

i think value is 10 @ kiss ma @***

2006-09-10 02:13:54 · answer #1 · answered by FIGHTER 2 · 1⤊ 0⤋

Let cosx =t

Then 4 t^2 +root(3)=2(root3+1).t

Arrange the terms to left

a=4
b=-2(root3+1)
c=root3

diskriminant= b^2-4ac
root discriminant==root(2). (1-root3) in the simplest form.

Hint: find the root of (2-root3)
Use the formula to fint t.
cosx=t
t=arc cos x

2006-09-10 08:50:32 · answer #2 · answered by iyiogrenci 6 · 0⤊ 1⤋

Are you sure you typed exactly?

2006-09-10 07:35:41 · answer #3 · answered by Babax 3 · 1⤊ 0⤋

what?
this does not sound right

2006-09-10 09:21:26 · answer #4 · answered by locuaz 7 · 0⤊ 0⤋