ive tried this but it doesnt seem to do the job:

class c_arccos(sage.calculus.calculus.Function_arccos):
    def __init__(self):
        pass
    def _latex_(self):
        return "\\arccos"

p_arccos = c_arccos()

print latex(p_arccos(1/3))
print latex(p_arccos)

#############
#outputs:
############

\cos^{-1} \left( \frac{1}{3} \right)
\arccos

the first line still outputs \cos^{-1} instead of arccos
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