![]() | |
| | #1 (permalink) |
| New Member HSC: 2011 Gender: Male
Join Date: May 2009
Posts: 12
Last Activity:
2 Nov 2009, 6:11 PM ![]() | Help with Trigonometry Equations [URGENT] You can hide this advertisement by registering. Hey guys I need urgent help so please reply asap ![]() I was studying for my SAC and came across this unusual question. Find x, 0(degrees)<x<360(degrees). {The arrows have the underline as well} tan^2x + (sqrt(3) - 1)tanx = sqrt(3) HELP PLEASE Thanks in advance :} P.S The square root only applies to the 3 |
| | |
| | #2 (permalink) |
| New Member HSC: 2009 Gender: Undisclosed
Join Date: Jan 2009
Posts: 21
Last Activity:
6 Nov 2009, 5:39 PM ![]() | Re: Help with Trigonometry Equations [URGENT] 1. First, let a = tan(x) 2. Next, substitute the a into the equation: a^2 + (sqrt(3)-1)a = sqrt(3) 3. Transpose the sqrt(3) to the LHS: a^2 + (sqrt(3)-1)a-sqrt(3) = 0 4. Expand the brackets for the coefficient of a: a^2 + sqrt(3)a-a-sqrt(3) = 0 5. Rearrange the equation to be of the form a^2 - a + sqrt(3)a -sqrt(3) = 0. 6. Factorise by taking a common factor of (a-1) out of the first two and the last two terms: a(a-1)+ sqrt(3)(a-1) = 0 7. Now the equation becomes (a-1)(a+sqrt(3))=0 8. Using the null factor law: a-1 = 0 OR a+sqrt(3) = 0 9. a = 1 OR a = -sqrt(3) 10. Substitute a = tan(x) back. Hence, tan(x) = 1 or tan(x) = -sqrt(3) 11. x = pie/4, 5pie/4 OR x = 2pie/3, 5pie/3 12. Therefore, x = pie/4, 2pie/3, 5pie/4, 5pie/3 (all in radians) Last edited by dmpiq; 18 Oct 2009 at 10:47 PM. |
| | |
| | #3 (permalink) |
| New Member HSC: 2011 Gender: Male
Join Date: May 2009
Posts: 12
Last Activity:
2 Nov 2009, 6:11 PM ![]() | Re: Help with Trigonometry Equations [URGENT] Thanks for your kind help! I just asked my teacher today about this problem and he showed me how to do it. Thank you anyways for your generous help. Really Appreciated. ![]() Sincerely yours, Animetony |
| | |
![]() |
| Bookmarks |
| Thread Tools | |
| Rate This Thread | |
| |