
#1
Dec2410, 01:44 AM

P: 1

without solving the differential equation(cosx)y''+y'+5y =0, find a lower bound for the radius of convergence of power series solutions about x = 0. about x = 1.




#2
Dec2410, 06:20 AM

Math
Emeritus
Sci Advisor
Thanks
PF Gold
P: 38,886

Any solution to that equation will be analytic (and so its Taylor series will converge) as long as the coefficient of y'' is not 0. Find the least distance from 0 (and then 1) to a point where cos(x) is 0.



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