Functions can have several arguments. For g, you can define a python
function that returns multiple arguments - this is then a tuple that you can
unwrap with "*". Look carefully at the following session:
sage: var('a b c x y z')
(a, b, c, x, y, z)
sage: f(x,y,z) = a*x^2+b*x+c
sage: f(1,2,3)
a + b + c
sage: f(2,3,4)
4*a + 2*b + c
sage: def g(x,y,z):
....: return x^2, y^2, z^2
....:
sage: f(*g(tan(x), sin(x), cos(x)))
a*tan(x)^4 + b*tan(x)^2 + c
sage: f(*g(tan(x), sin(2*x), 2*cos(x)))
a*tan(x)^4 + b*tan(x)^2 + c
H
PS: your definition of f might be wrong, because there is a y and z but it
is not used on the right-hand side!
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