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April 20th, 2018, 06:32 AM   #1
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Question Determine values of valuables where identities are undefined

1.Cos 2x /Cosx - Sinx = Cos x + Sinx

2.1-Sinx / Sinx - Cosx = Sinx - Cosx
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April 20th, 2018, 06:57 AM   #2
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Quote:
Originally Posted by Vee88 View Post
1.Cos 2x /Cosx - Sinx = Cos x + Sinx

2.1-Sinx / Sinx - Cosx = Sinx - Cosx
"valuables" ... ? maybe you mean variables?

for the first identity, if you meant to post ...

Quote:
Cos 2x /(Cos x - Sin x) = Cos x + Sinx
$\dfrac{\cos(2x)}{\cos{x}-\sin{x}} = \cos{x}+\sin{x}$

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
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April 20th, 2018, 07:05 AM   #3
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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.
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April 20th, 2018, 07:38 AM   #4
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Good Evening

Thank you for your assistance it really helps , I'll check the sum and question and post again .
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