Question: How can I solve two equations?

How I can find the coefficient an, and bn according to the following solution?

the coefficients an and bn can be found by solving the
two linear equations that come from V = V[0] at eta=eta[0] and 
V = V[1] at eta=eta[1], and comparing with following Eq in each
case.

Best

2.mw

 

 

 

 

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