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2013-10-20 03:22:35 -0600 asked a question TypeError: ECL says: Maxima asks: Is y positive, negative, or zero?

I'm using sage to give me the inverse of functions using solve(). Most of the time, it works fine. But when I have roots of anything involved(for example, "solve((5x-2)^(1/7)==y,x)", I get the error message in the title. Is there any way around this?

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2013-10-10 12:02:53 -0600 asked a question Can sage be used to solve the following kind of problem?

"Given that f(1) = 9, f'(1) = 5, g(9) = 6 and g'(9) = 4, what is the approximate value of g(f(1.05))?"

2013-09-27 03:20:25 -0600 asked a question Sage Calculus Tutorial -- continuity practice problems

Can anyone help me understand how to do some of the practice problems in the sage calculus tutorial? In particular, I'm stuck on problems 5 and on at the bottom of this page http://www.sagemath.org/calctut/conti...

For example, I am not sure how to define 'k'. As it stands, graphing the function in problem 5, sage does not know what to do with the variable 'k', because it is not defined.