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So, I have a function: $f(x) = a\cdot x + b\cdot x + \varepsilon$, where $\varepsilon \sim \mathcal{N}(0, a+2b)$

I want to derive this function to one of the parameters (for example $a$) when performing a sensitivity analysis, but I get stuck with the epsilon part. Somebody has an idea?

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For some basic information about writing math at this site see e.g. here, here, here and here. –  Julian Kuelshammer Jan 22 '13 at 10:20
    
What is $N(0,a+2b)$? –  ArthurStuart Jan 22 '13 at 12:08
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