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Example 114
$\;\;\;(5v^{4} + 11u^{6})(5v^{4} - 11u^{6})$
$=(A + B)( A - B) \text{ , where } A = 5v^{4} \text{ and } B = 11u^{6} $
$=A^2-B^2$
$=(5v^{4})^2 - (11u^{6})^2 $
$=25v^{8} - 121u^{12} $
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