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[This image show an example in a textbook that am having difficulty in understand how they get 2.12.81 and 2.12.82][1]

Kindly help with the value of B [1]: https://i.sstatic.net/k4HaF.jpg

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  • $\begingroup$ Hi, I highly recommend you to take a tour, in order to avoid downvotes. If the question is well written surely someone will come to help! $\endgroup$ Commented Sep 24, 2023 at 16:21

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