Final Answer
$a^4-4a^2-2a+\frac{-1}{a^2}+1$
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Step-by-step Solution
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1
Combining like terms $-4a$ and $2a$
$a^4-4a^2-2a+\frac{-1}{a^2}+1$
Final Answer
$a^4-4a^2-2a+\frac{-1}{a^2}+1$