Usual functions

### 5.16.2 Usual functions

- max takes as argument two real numbers and returns their maximum,
- min takes as argument two real numbers and returns their minimum,
- abs takes as argument a complex number and returns the modulus of the complex parameter (the absolute value if the complex is real),
- sign takes as argument a real number and returns its sign (+1 if it is positive, 0 if it is null, and -1 if it is negative),
- floor (or iPart) takes as argument a real number r, and returns the largest integer ≤ r,
- round takes as argument a real number and returns its nearest integer,
- ceil or ceiling takes as argument a real number and returns the smallest integer ≥ r
- frac (or fPart) takes as argument a real number and returns its fractional part,
- trunc takes as argument a real number and returns the integer equal to the real without its fractional part,
- id is the identity function,
- sq is the square function,
- sqrt is the squareroot function,
- exp is the exponential function,
- log or ln is the natural logarithm function,
- log10 is the base-10 logarithm function,
- logb is the logarithm function where the second argument is the base of the logarithm: logb(7,10)=log10(7)=log(7)/log(10),
- sin (resp. cos, tan) is the sinus function, cosinus function, tangent function,
- cot, sec, csc are the cotangent, secant, cosecant function
- asin (or arcsin), acos (or arccos), atan (or arctan), acot, asec, acsc are the inverse trigonometric functions (see section 5.21.1 for more info on trigonometric functions)
- sinh (resp. cosh, tanh) is the hyperbolic sinus function, cosinus function, tangent function,
- asinh or arcsinh (resp. acosh or arccosh, atanh or arctanh) is the inverse function of sinh (resp. cosh, tanh)