Evaluate the expression \[ (a^2+b)^2 - (a^2-b)^2, \]if $a=4$ and $b=1$.
Question:
Evaluate the expression \[ (a^2+b)^2 - (a^2-b)^2, \]if $a=4$ and $b=1$.
Answer:
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Evaluate the expression \[ (a^2+b)^2 - (a^2-b)^2, \]if $a=4$ and $b=1$.
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