+  1+1=2  add 
  21=1  subtract 
*  7*5=35  multiply 
/  35/7=5  divide 
**  2**8=256  power 
sqrt( )  sqrt(9)=3  square root 
int( )  int(pi)=3  integer value 
abs( )  abs(1.3)=1.3  absolute value 
deg( )  deg(pi)=180  convert from radians to degrees 
rad( )  rad(180)=pi  convert from degrees to radians 
sin( )  sin(pi/6)=0.5  sine 
cos( )  cos(pi/3)=0.5  cosine 
tan( )  tan(pi/4)=1  tangent 
asin( )  asin(1)=pi/2  arc sine 
acos( )  acos(0)=pi/2  arc cosine 
atan( )  atan(1)=pi/4  arc tangent 
exp( )  exp(0)=1  exponential value 
log( )  log(100)=2  logarithm to base 10 
log( ,base)  log(9, 3)=2  logarithm to the given base 
ln( )  ln(e)=1.0  natural logarithm 
fact( )  fact(9)=362880  factorial 
mod( , )  mod(65, 7)=2  modulo 
rand  exp(rand)  random floating point number in the range [0.0, 1.0) 
dice  sqrt(dice)  random integer between 1 and 6 
ans  deg(ans)  carry over result of previous calculation 
[n]  rad([2])  carry over result of nth calculation 
pi 
π: ratio of circle's circumference to its diameter (defined with many significant digits) 

e  base of natural logarithm (defined with many significant digits)  
g  standard gravity (9.80665 m/s**2)  
R  ideal gas constant (8.3144621 J/(K*mol))  
N  Avogadro's constant (6.02214129E+23) 