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## Homework Statement

The problems are in the uploaded file. 18) satisfies the differential equation

y

^{''}+p(t)*y

^{'}+q(t)*y=0

p(t) and q(t) are continuous

## Homework Equations

Wronskian of y

_{1}and y

_{2}

## The Attempt at a Solution

18) I don't really get this one

19) Solved most but at the end, where I got y

_{2}(t)=c*y

_{1}(t)

I got the value of c for when t=t

^{*}but here y

_{2}=0. Can I still use it here?

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