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Exercícios de Cálculo Integral e Diferencial I

Exercícios de Cálculo Integral e Diferencial I

Exercícios de Cálculo Integral e Diferencial I

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i) Aplicando o método <strong>de</strong> integração por substituição,<br />

√ x = t ⇒ x = ϕ(t) = t 2<br />

π 2 /4<br />

integrando por partes,<br />

<br />

ii) Tem-se<br />

= 2<br />

0<br />

[−t. cos t] π/2<br />

0<br />

sen( √ x) dx =<br />

−<br />

π/2<br />

0<br />

π/2<br />

0<br />

cos t dt<br />

sen t.2t dt =<br />

<br />

= 2 [sen t] π/2<br />

0<br />

2h(x)h ′ (x) = 2h(x) ⇔ 2h(x) (h ′ (x) − 1) = 0<br />

Como <strong>de</strong> h ′ (x) − 1 = 0, <strong>de</strong>duz-se que h(x) = x + C,<br />

(x + C) 2 = 2<br />

don<strong>de</strong> C = √ 2.<br />

x<br />

0<br />

= 2<br />

(t + C)dt + 2 ⇔ x 2 + 2Cx + C 2 = t 2 /2 + Ct x<br />

0<br />

28<br />

+ 2

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