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Example 104
$\;\;\;(5u^{5} + 4v^{10})(5u^{5} - 4v^{10})$
$=(A + B)( A - B) \text{ , where } A = 5u^{5} \text{ and } B = 4v^{10} $
$=A^2-B^2$
$=(5u^{5})^2 - (4v^{10})^2 $
$=25u^{10} - 16v^{20} $
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