Question

use suitable identities

Answer 1

ok hope this may help u

Answer 2

$\bf \large \: \bigg( {x}^{2} + \frac{1}{ {x}^{2} } \bigg) \bigg( {x}^{2} - \frac{1}{ {x}^{2} } \bigg ) \\ \\ \rm = > {( {x}^{2} )}^{2} - { \bigg( \frac{1}{ {x}^{2} } \bigg)}^{2} \\ \\ \boxed{ \sf = > \red{{x}^{4} - \frac{1}{ {x}^{4} } }}$