
Algebra PreAlgebra and Basic Algebra Math Forum 
 LinkBack  Thread Tools  Display Modes 
February 21st, 2014, 10:19 AM  #1 
Newbie Joined: Feb 2014 Posts: 1 Thanks: 0  if sin(theta)= .1234 find (theta) in [4pi,pi]
If sin(theta)= .1234, find all (theta) in [4pi,pi] that make this equation true. What I have so far: sin is negative in QIII,QIV sin^1(.1234)=.1237 0  .1237 = .1237 pi + .1237 = 3.0179 2pi  .1237 = 6.4069 3pi + .1237 = 9.2011 There's nothing from 0 to pi, and from 3pi to 4pi since I need where sin is negative? Thanks for the help! 
February 21st, 2014, 12:35 PM  #2 
Math Team Joined: Dec 2006 From: Lexington, MA Posts: 3,267 Thanks: 407  Re: if sin(theta)= .1234 find (theta) in [4pi,pi] Hello, mauro125! Correct! Good work! 
February 21st, 2014, 02:33 PM  #3 
Senior Member Joined: Dec 2012 Posts: 372 Thanks: 2  Re: if sin(theta)= .1234 find (theta) in [4pi,pi]
Hey there. You can also use the identity to view things a little clearer.

February 22nd, 2014, 05:57 PM  #4  
Global Moderator Joined: Dec 2006 Posts: 20,095 Thanks: 1905  Quote:
 

Tags 
1234, 4pi, find, sintheta, theta 
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 03:19 PM 
d²y/dx² and theta angle  Jhenrique  Calculus  1  November 23rd, 2013 11:02 AM 
[P*cos (theta)]  [A*sin(theta)] = 0, thus tan(theta)=(P/A)?  FelisCanisOfCadog  Algebra  4  March 6th, 2009 09:05 PM 
Theta Comparsion Help  animedear  Applied Math  5  September 21st, 2008 08:21 AM 
Theta Comparison Help  animedear  Calculus  1  September 19th, 2008 08:52 PM 