Applied Mathematics and Computation (Algebra)

gabsantos02

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Sep 9, 2017
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From Equation 11 and Equation 12, how will I be able to get the equations in Equation 13? I tried many times but I failed. I am still trying now but I really don't know what to do. Please help me, its for thesis, I really need to understand it. Thank you very much for you help!

The case is very similar with these. Please help me. I tried squaring and cubing but nothing is cancelled, so I think there must be a process which I don't know.
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