Question

(1+x^2^n) * (1-x^2^n)

Answer 1

1 -x^4n.....................

Answer 2

$= (1 + {x}^{ {2}^{n} } )(1 - {x}^{ {2}^{n} }) \\ \\ = {(1)}^{2} - {( {x}^{ {2}^{n} } )}^{2} \\ \\ = 1 - {x}^{2 \times n \times 2} \\ \\ = 1 - {x}^{4n}$