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Example 107
$\;\;\;(5 + 6v^{3})(5 - 6v^{3})$
$=(A + B)( A - B) \text{ , where } A = 5 \text{ and } B = 6v^{3} $
$=A^2-B^2$
$=(5)^2 - (6v^{3})^2 $
$=25 - 36v^{6} $
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