Mathematics Stack Exchange is a question and answer site for people studying math at any level and professionals in related fields. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

How do I solve this equation in Mathematica? Using the NSolve command doesn't work!

0.59*Sqrt[x]*Sin[0.2*Sqrt[x]] + 1.7*(Cos[0.3*Sqrt[x]] - 
    Coth[0.1*Sqrt[x]]*Sin[0.8*Sqrt[x]]) = 0


share|cite|improve this question

use ==, the test operator for equality, not =, the assignment operator

share|cite|improve this answer
doesn't work, this is not the problem, please – George Oct 23 '11 at 18:00
You need to be more descriptive in your question. What error message does Mathematica give? Do you know there are actually solutions? From your use of = instead of ==, I'm guessing you aren't a Mathematica veteran. The problem is probably that you misused the function, and didn't provide the correct arguments, so Mathematica just spit out whatever you typed in unevaluated. Is that the problem? – JeremyKun Oct 23 '11 at 18:11

May you could use few calls to FindRoot,like this one:

FindRoot[0.59 Sqrt[x] Sin[0.2 Sqrt[x]] + 1.7 (Cos[0.3 Sqrt[x]] - Coth[0.1 Sqrt[x]] Sin[0.8 Sqrt[x]]) ==  0, {x, 2}]

Does this suffices your purpose?

share|cite|improve this answer
Of course, it is imperative that you come up with a good seed for FindRoot[]. :) – J. M. Oct 23 '11 at 21:24

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.