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\textbf{Math 126A: Calculus II}
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\textbf{Quiz 6}\quad \textsl{October 6, 1999}

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Be sure to \emph{show all your work and include all important steps}.

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1. Evaluate
\[
\int_{-\infty}^{\infty}\frac x{(x^2+4)^{3/2}}\,dx
\]

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2. Write out the first five terms of the sequence defined by
\[
a_n=\frac{1-(-1)^n}{n!}
\]

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