Extract complete argument and function name(s) from the Expression, (standard mathematical functions only) MAPLE

Question

For expressions like

a1 := sin(1+a/b);
a2 := log(1+ a*b);
a3 := abs(a^2+b);

how can I get expressions of respective functions. For example

Answer 1

You can use the op() command, which breaks down expressions into their operands. For instance:

f := sin(1+a/b);
g := op(0,f); # sin
h := op(1,f); # 1+a/b