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\centerline{\bf Math.~125 Quizz \#8}
\centerline{November 10, 1998}
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\noindent1. 
Evaluate the indefinite integral
$$\int x^3\cdot \sqrt{4-x^2}\ dx$$
by using the substitution $u=4-x^2$.

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\noindent 2. On the last exam you checked that
$x\sin x + \cos x$ was an anti{--}derivative for
$x\cos x$.
Use this and substitution to evaluate the indefinite integral
$$\int \cos(\sqrt x)\ dx\ .$$

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