Finding the roots isn't so easy

July 03 2009 by Christopher2222 3129
false
Maple

0


fsolve(x^2/20-10*x-15*cos(x+15),x);

1.274092075

I know to get maple to give me the other root I have graphically examine the funtion to see that it's around 200.  I need to use fsolve using x=190..210 to find it.  But that's a bit of a pain, I don't want to have to graph the function everytime, if my limits aren't far enough I may not find it. 

The Student[Calculus1] package won't find the roots using Roots since I believe it only deals with simple trigonometric functions.  Using solve I get a RootOf answer but it won't show me the numeric roots. 

What I want, is to find the roots without having to specify a range.  I could be missing something simple here but I'm stuck.  Anyone have some suggestions? 

 
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