negative number raised to even power

[Marcus von Cube]

(04-26-2015 06:22 PM)TASP Wrote:  2
chs
^
2
chs
y\x


yields 'error'

You are computing (-2)^(-2) (not the original expression!) which is most probably computed as exp(ln(-2)*(-2)). A calculator that only handles real numbers cannot compute ln(-2). Try the x² key instead.