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Solução_Calculo_Stewart_6e

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F.<br />

TX.10<br />

CHAPTER 10 REVIEW ¤ 447<br />

1. x = t 2 +4t, y =2− t, −4 ≤ t ≤ 1. t =2− y,so<br />

x =(2− y) 2 +4(2− y) =4− 4y + y 2 +8− 4y = y 2 − 8y +12<br />

⇔<br />

x +4=y 2 − 8y +16=(y − 4) 2 .Thisispartofaparabolawithvertex<br />

(−4, 4), opening to the right.<br />

3. y =secθ = 1<br />

cos θ = 1 .Since0 ≤ θ ≤ π/2, 0

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