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Example 120
$\;\;\;(1 + 9u^{5}v^{8})(1 - 9u^{5}v^{8})$
$=(A + B)( A - B) \text{ , where } A = 1 \text{ and } B = 9u^{5}v^{8} $
$=A^2-B^2$
$=(1)^2 - (9u^{5}v^{8})^2 $
$=1 - 81u^{10}v^{16} $
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