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Nope. That would mean $c(X)$ is always nonnegative, but that can't be thethat way (unless it's always $0$) because it takes two opposite signsswitches sign if you takereplace$C=1$ and$C$ with$C=-1$$-C$.
Nope. That would mean $c(X)$ is always nonnegative, but that can't be the way (unless it's always $0$) because it takes two opposite signs if you take$C=1$ and$C=-1$.
Nope. That would mean $c(X)$ is always nonnegative, but that can't be that way (unless it's always $0$) because it switches sign if you replace$C$ with$-C$.
Nope. That would mean $c(X)$ is always nonnegative, but that can't be the way (unless it's always $0$) because it takes two opposite signs if you take $C=1$ and $C=-1$.
