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Solução_Calculo_Stewart_6e

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F.<br />

50 ¤ CHAPTER 2 LIMITS AND DERIVATIVES<br />

1<br />

43. Since |x| = −x for x0, lim sgn x = lim 1=1.<br />

x→0 + x→0 +<br />

(ii) Since sgn x = −1 for x

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