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April 20th, 2018, 05:32 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, 05:57 AM  #2  
Math Team Joined: Jul 2011 From: Texas Posts: 2,751 Thanks: 1401  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, 06:05 AM  #3 
Global Moderator Joined: Dec 2006 Posts: 18,961 Thanks: 1605 
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, 06:38 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 . 

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determine, identities, undefined, valuables, values 
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