
Algebra PreAlgebra and Basic Algebra Math Forum 
 LinkBack  Thread Tools  Display Modes 
June 13th, 2010, 07:07 PM  #1 
Newbie Joined: Jun 2010 Posts: 1 Thanks: 0  How are these the first three positive values of theta? (Inv
For the inverse function, arccos(4/5)=4(theta40*), I have to find the three first positive values of theta. Simplified, I got the equations: 49.217+(?n/2) and 30.7825+(?n/2). Using these equations, I got the three positive values: 30.7823, 32.3533, and 49.2174. However, the book says the first three positive values are 30.7823* (got that one),49.2174*(got that one too), and 120.783* (didn't get this one).

June 14th, 2010, 09:33 AM  #2  
Math Team Joined: Dec 2006 From: Lexington, MA Posts: 3,267 Thanks: 408  Re: How are these the first three positive values of theta? (Inv Hello, Noraowolf! [color=red]skipjack is right . . . I blew it![/color] Quote:
[color=beige]. . . . . . . . [/color] [color=beige]. . . . . . . . . . . . . [/color] [color=beige]. . . . . . . . . . . . . . [/color] [color=beige]. . . . . . . . . . . . . . [/color]  
June 14th, 2010, 11:10 AM  #3 
Global Moderator Joined: Dec 2006 Posts: 20,467 Thanks: 2038 
That is incorrect. Hence the first few positive values are 30.7825°, 49.2175°, 120.7825° and 139.2175°. 

Tags 
inv, positive, theta, values 
Search tags for this page 
Click on a term to search for related topics.

Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
prove : A X B = ab sin (theta)  MATHEMATICIAN  Algebra  12  January 4th, 2015 02:19 PM 
if sin(theta)= .1234 find (theta) in [4pi,pi]  mauro125  Algebra  3  February 22nd, 2014 04:57 PM 
Eliminating theta???  MadSoulz  Algebra  6  September 10th, 2012 08:26 PM 
Positive semidefinite values  Paul4763  Linear Algebra  9  April 25th, 2011 01:00 PM 
[P*cos (theta)]  [A*sin(theta)] = 0, thus tan(theta)=(P/A)?  FelisCanisOfCadog  Algebra  4  March 6th, 2009 08:05 PM 