
Trigonometry Trigonometry Math Forum 
 LinkBack  Thread Tools  Display Modes 
April 20th, 2018, 06:32 AM  #1 
Newbie Joined: Apr 2018 From: East London Posts: 12 Thanks: 0  Determine values of valuables where identities are undefined
1.Cos 2x /Cosx  Sinx = Cos x + Sinx 2.1Sinx / Sinx  Cosx = Sinx  Cosx 
April 20th, 2018, 06:57 AM  #2  
Math Team Joined: Jul 2011 From: Texas Posts: 2,773 Thanks: 1427  Quote:
for the first identity, if you meant to post ... Quote:
this identity is undefined at values of $x$ where $\cos{x}=\sin{x}$ the second equation is not an identity ... you may want to recheck it  
April 20th, 2018, 07:05 AM  #3 
Global Moderator Joined: Dec 2006 Posts: 19,865 Thanks: 1833 
Determine when the denominator is zero... what value will tan(x) have? The second equation is okay if interpreted correctly, so that its denominator is zero in the same circumstances. 
April 20th, 2018, 07:38 AM  #4 
Newbie Joined: Apr 2018 From: East London Posts: 12 Thanks: 0 
Good Evening Thank you for your assistance it really helps , I'll check the sum and question and post again . 

Tags 
determine, identities, undefined, valuables, values 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Rate of change to determine missing values in table  Sparkleandpop  Linear Algebra  1  September 29th, 2015 03:44 AM 
undefined?  SMARTYPANTS  Algebra  3  July 29th, 2014 10:12 PM 
using a set of data to determine values on the same line  ka0ttic  Computer Science  3  March 17th, 2014 05:08 AM 
0^0 = 0/0 = undefined  caters  Algebra  24  February 22nd, 2014 09:04 AM 
Determine equation given a table of values  dendimiiii  Applied Math  1  February 12th, 2014 09:18 AM 