Example 98

$\;\;\;(4x^{3} + y^{3})(4x^{3} - y^{3})$

$=(A + B)( A - B) \text{ , where } A = 4x^{3} \text{ and } B = y^{3} $

$=A^2-B^2$

$=(4x^{3})^2 - (y^{3})^2 $

$=16x^{6} - y^{6} $