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Thanks, it works. But Sage seems unable to remove the integral and write the derivative in a simple way... It also fails

Thank you. So nothing wrong with this function… But why I receive an error message if I try to differentiate it?!? I und

Function defined with an integral Dear all, I'm puzzled by this answer from Sage: sage: def f(x): ....: return inte

Dear all,

if we define A to be

A = matrix([[1,-3,0,2],[-2,4,0,h],[0,-2,1,k],[3,-1,7,1]])
A.echelon_form()

gives diag(1,1,1,1). But this is wrong for some values of h and k.In some cases the last 1 could be 0.

How can I fix this? Thanks, N

diag not drag :-)

I see. Thanks. But in this case I have to enter the values for h and k. That's not what I want... I'd like Sage to tell

Sorry not clear enough for me … What do you mean?

Problem with matrix echelon form Dear all, if we define A to be A = matrix([[1,-3,0,2],[-2,4,0,h],[0,-2,1,k],[3,-1,7,1]

Integral of a sum Dear all, I don't understand why I got Infinity calculating the integral of a polynomial over the inte

Trigonometric equations Hello Is it possible to find all the solutions of a simple trigonometric equation? For instance