I Would Really Appreciate It If The Steps Are Detailed And Clear Please Do No Us

please help me with the following. I would really appreciate it if the steps are detailed and clear. Please do no use wronskian method for this variation of parameters problem

. use y1v1’+y2v2’=0 and 

y1’v1’+y2’v2’=f(t)/a method ONLY. 

 
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