- #1
sh86
- 19
- 0
Hey I was doing a standard derivative problem but I ran into something somewhat strange. Check it out:
[tex]\frac{d}{dx}\sum_{i=1}^xx=\frac{d}{dx}x^2=2x[/tex]
Okay, simple enough..but what if I write it like this?
[tex]\frac{d}{dx}\sum_{i=1}^xx=\frac{d}{dx}(x+x+...+x)=1+1+...+1=x[/tex].
Why am I getting two different answers?
[tex]\frac{d}{dx}\sum_{i=1}^xx=\frac{d}{dx}x^2=2x[/tex]
Okay, simple enough..but what if I write it like this?
[tex]\frac{d}{dx}\sum_{i=1}^xx=\frac{d}{dx}(x+x+...+x)=1+1+...+1=x[/tex].
Why am I getting two different answers?