Mathematica inbuilt (pre-defined) mathematical functions

Here is a list of some useful (and obviously defined) mathematical functions:

Name	Description
Sqrt[x]	square root of x
Exp[x]	exponential $e^x$
Log[x]	natural logarithm of x (i.e. base e)
Log[b,x]	logarithm of x base b
Factorial[n]	factorial of n
Sin[x]	trigonometric functions, with the arguments in radians!
Cos[x]
Tan[x]
ArcSin[x]	inverse trigonometric functions
ArcCos[x]
ArcTan[x]
Sinh[x]	hyperbolic trigonometric functions
Cosh[x]
Tanh[x]
ArcSinh[x]	inverse hyperbolic trigonometric functions
ArcCosh[x]
ArcTanh[x]
Abs[z]	absolute value of x (even when z is a complex number)
Re[z]	real part
Im[z]	imaginary part
Arg[z]	argument of x (normally used when z is a complex number)
Conjugate[z]	complex conjugate of z
Round[x]	closest integer to x
IntegerPart[x]	integer part of x
Mod[k, x]	k modulo n, i.e. the remainder of
	k when its divided by n