a^3 + a^2 - a^-2 - a^-3
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a³+a²-a^-2-a^-3
a²-1/a²-1/a³
steps
a³+a²-a²-a³
apply exponent rule:a^-b=1/a^b
a^-2=1/a²
a³+a²-1/a²-a^-3
apply exponent rule:a^-b=1/a^b
a^-3=1/a³
=a³+a²-1/a²-1/a³
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