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.TH GIAC 1 "2014-4-6"
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.SH NAME
giac \- computer algebra system
.SH SYNOPSIS
.B cas_help
.RI " keyword" 
.br
.B en_cas_help
.RI " keyword" 
.br
.B es_cas_help
.RI " keyword" 
.br
.B fr_cas_help
.RI " keyword" 

.SH DESCRIPTION
.PP
.\" TeX users may be more comfortable with the \fB<whatever>\fP and
.\" \fI<whatever>\fP escape sequences to invode bold face and italics, 
.\" respectively.
This is the help engine of the symbolic and numeric calculator \fBgiac\fP  by
Bernard Parisse. It is avaible in some different languages.

.br
.SH EXAMPLE
.B cas_help 
gcd
.TP
Help for gcd:
.br
gcd((Intg(a) or Poly),(Intg(b) or Poly))
.br 
Returns the greatest common divisor of 2 polynomials of several variables or of 2 integers or of 2 rationals.
.br
See also: 1/ lcm 2/ euler 2/ modgcd 3/ ezgcd 4/ psrgcd 5/ heugcd 6/ Gcd 
.br
Ex1:gcd(45,75)
.br
Ex2:gcd(15/7,50/9)
.br
Ex3:gcd(x^2-2*x+1,x^3-1)
.br
Ex4:gcd(t^2-2*t+1,t^2+t-2)
.br
Ex5:gcd((x^2-1)*(y^2-1)*z^2,x^3*y^3*z+(-(y^3))*z+x^3*z-z)
.br

.SH SEE ALSO
.B giac (1)
.B icas (1)
.B xcas (1)
.br
.SH COPYRIGHT
These files are part of the (GPLv3+) giac sofware.