x	independent variable
+	plus
-	minus
*	multiplied by
/	divided by
^ or #	power
(...)	bracket
abs(...)	absolute value
sqrt(...)	square root
ln(...)	natural logarithm
sin(...)	sine
cos(...)	cosine
tan(...)	tangent
arcsin(...)	arcsine
arccos(...)	arccosine
arctan(...)	arctangent
e	Euler's number e
pi	circle number p