
Algebra PreAlgebra and Basic Algebra Math Forum 
 LinkBack  Thread Tools  Display Modes 
January 4th, 2018, 08:32 AM  #11 
Math Team Joined: Jan 2015 From: Alabama Posts: 2,966 Thanks: 807 
One definition of sine (and cosine) commonly used in Calculus texts is this: Set up a coordinate system with the unit circle, the graph of $x^2+ y^2= 1$. Starting at (1, 0), measure around the circumference a distance t. The coordinates of the end point are, by definition, (cos(t), sin(t)). In that case, t has no units because its length is just a multiple of the unit used in the coordinate system. The "radian" measurement is defined to fit that.


Tags 
expansion, mentioned, radians, sinx 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Solving using radians  bentroy743  Algebra  1  December 29th, 2012 03:26 PM 
radians  milly2012  Algebra  1  April 29th, 2012 08:26 AM 
Radians?  Phazon  Calculus  10  June 6th, 2011 05:08 PM 
trigonometry radians  nicolodn  Algebra  8  October 21st, 2010 05:47 AM 
Degrees and Radians  axelle  Algebra  7  October 22nd, 2007 01:48 PM 