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x=root_of(f(x),x1,x2,acc)
computes the root x (x1<=x<=x2) of equation f(x)=0.
acc is an optional parameter indicating the accuracy of the solution.
Default is acc=1e-14.
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Example: r=root_of(2*sin(x)-sqrt(x),0.1,2)  r=0.2555123276493
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root(n,x) gives the n'th root of x.
Examples: root(3,8)=2 root(12,2)=1.0594630943593
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See also
  P = Roots of algebraic equations (by POL operations) 
  M = Roots of systems of linear equations (by MAT operations) 


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