Differentiate an equation

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fluidistic
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My friend came up with the following:
[itex]2x=1 \Rightarrow \frac{d}{dx}(2x)=\frac{d}{dx}1 \Rightarrow 2=0[/itex]. Shamefully I do not see what's wrong with this reasoning!
Can someone help me? :)
 

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  • #2
LCKurtz
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2x=1 is not an identity. It is only true for x = 1/2.
 
  • #3
fluidistic
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Thank you LcKurtz, that makes sense.
 

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