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Question: perturbation theorie

Question:perturbation theorie

Math Pi Euler 30 Maple
differential-equation homework perturbation
March 23 2018
2

Hi all, I am having the follwing DE:

restart: 
(diff(z(x), x, x))-z(x) - cos(2*x)/(1+delta*z(x)) = 0:

With initial conditions: z(-pi/4)=z(pi/4)=0 and |delta|<<1

I showed by hand by using perturbation theory the second order approximation. The hint was: you can use Maple to check your answer. 

Is there somebody who can help me with this?

 

 
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