functions default

"!"
"^"
"_"
"% "
"\ "
"exp "
"10^"
"ln "
"log "
"sin "
"cos "
"tan "
"asin "
"acos "
"atan "
"sinh "
"cosh "
"tanh "
"asinh "
"acosh "
"atanh "
"erf "
"erfc "
"fac "
"gamma "
"sign "
"abs "
"frac "
"round "
"trunc "
"ceil "
"floor "
"conj "
"re "
"im "
"arc "
"sqrt "
"nPr "
"nCr "