$$( a ^ { 0 } + b ^ { 0 } ) \times ( a ^ { 0 } - b ^ { 0 } )$$
$0$
$$\left(1+b^{0}\right)\left(a^{0}-b^{0}\right)$$
$$\left(1+1\right)\left(a^{0}-b^{0}\right)$$
$$2\left(a^{0}-b^{0}\right)$$
$$2\left(1-b^{0}\right)$$
$$2\left(1-1\right)$$
$$2\times 0$$
$$0$$
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