title: Solve nonlinear equation on segment
body: <p>I am looking for a function which solves trigonometric equation on a given segment. </p>
  
  <p>I've tried <a href="https://docs.scipy.org/doc/scipy-0.14.0/reference/generated/scipy.optimize.fsolve.html" rel="nofollow noreferrer">fsolve</a> from scipy, but as I understood, there is not such option, just only the initial approximation point. </p>
  
  <p>Does python have such a library method anywhere? Also I've looked at <a href="http://docs.sympy.org/dev/modules/solvers/solvers.html" rel="nofollow noreferrer">sympy</a>, but did not find any appropriate solutions there.</p>