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Solução_Calculo_Stewart_6e

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F.<br />

TX.10<br />

SECTION 2.8 THEDERIVATIVEASAFUNCTION ¤ 77<br />

53. (a) f(x) =x |x| =<br />

<br />

x<br />

2<br />

if x ≥ 0<br />

−x 2 if x0.<br />

[See Exercise 2.8.17(d).] Similarly, since f(x) =−x 2 for<br />

x

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