Cube root function is screwed up

Originally reported on Google Code with ID 413 ``` What steps will reproduce the problem? 1.type in cbrt(250) 2. it returns 6 (!?)

What is the expected output? What do you see instead? something other than 6! last I checked, 6 cubed is 216, so cbrt(250) shouldn't return 6!

What version of the product are you using? On what operating system?

0.10.1 on linux

Please provide any additional information below.

Not too critical because you could use "^(1/3)" instead of cube root function, but still, you need to fix this because people need to be able to trust the functions on their calculator. ```

Reported by `nburgin@purdue.edu` on 2012-10-04 18:45:15

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