I have this equation: $y=Cxe^{-2x}$
I worked out the first derivative and checked with wolfram alpha to get: $y=Ce^{-2x}+-2Cxe^{-2x}$
But when I try and get the first derivative in my calculator, I get: $-2Cxe^{-2x}$ without the first term.
Why is this the case?
That is the result you get if you write $Cxe^{-2x}$ and forget to enter $\times$ (times) between the $x$ and the $e^{-2x}$. It treats the first $x$ as a constant.
p.s. I verified this with my own N-Spire.