Thank you for your answer. Actually I just showed my problem simplified. On Jun 19, 10:17 pm, Harald Schilly <[email protected]> wrote: > 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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