So, x is equal to in first one डी you are considering it is E is equal to because it is here to here , right, this is equation 16 similarly from x is equal to to x is equal to that is that second layer permittivity is that means, that means your; just hold on.
त्याच प्रमाणेच x=पासून x=पर्यंत म्हणजेच दुसऱ्या थराची परमिटिव्हिटी आहे म्हणजेच