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## Combine terms of same type : combine

combine takes two arguments : an expression and the name of a function or class of functions exp,log,ln, sin,cos,trig.
Whenever possible, combine put together subexpressions corresponding to the second argument:
• combine(expr,ln) or combine(expr,log) gives the same result as lncollect(expr)
• combine(expr,trig) or combine(expr,sin) or combine(expr,cos) gives the same result as tcollect(expr).
Input :
combine(exp(x)*exp(y)+sin(x)*cos(x)+ln(x)+ln(y),exp)
Output :
exp(x+y)+sin(x)*cos(x)+ln(x)+ln(y)
Input :
combine(exp(x)*exp(y)+sin(x)*cos(x)+ln(x)+ln(y),trig)
or
combine(exp(x)*exp(y)+sin(x)*cos(x)+ln(x)+ln(y),sin)
or
combine(exp(x)*exp(y)+sin(x)*cos(x)+ln(x)+ln(y),cos)
Output :
exp(y)*exp(x)+(sin(2*x))/2+ln(x)+ln(y)
Input :
combine(exp(x)*exp(y)+sin(x)*cos(x)+ln(x)+ln(y),ln)
or
combine(exp(x)*exp(y)+sin(x)*cos(x)+ln(x)+ln(y),log)
Output :
exp(x)*exp(y)+sin(x)*cos(x)+ln(x*y)

giac documentation written by Renée De Graeve and Bernard Parisse