How do I find all the positive roots of (e^(-.2x ))(cos(2x))-.15x^2+1

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Rachel
Rachel on 16 Apr 2013
Commented: Rebecca on 11 Apr 2014
I only know how to do this with polynomials.

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Accepted Answer

Azzi Abdelmalek
Azzi Abdelmalek on 16 Apr 2013
syms x,
y=exp(-.2*x )*cos(2*x)-.15*x^2+1
sol=solve(y)
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Rebecca
Rebecca on 11 Apr 2014
How do you compute all three of its positive roots. When I enter this into Matlab I only get one of its positive roots.

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