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February 21st, 2014, 09:19 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, 11:35 AM  #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, 01:33 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, 04:57 PM  #4  
Global Moderator Joined: Dec 2006 Posts: 18,963 Thanks: 1606  Quote:
 

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1234, 4pi, find, sintheta, theta 
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