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Let C be the closed curve defined by r(t) = costi + sin tj + sin 2tk for 0 <t< 27. (a) (5 pts] Show that this curve C lies on

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C: 8(t) = cost i sint ý tsinatř, os t=20 a) x = cost, y=sint, z = sinet But from trigonometry Sinat=rsintost > z=2sintcost Z

CurlF = - 2zî -ġ - 3 y? Now, & fods = }} (-22 7-9 – 3y? f)- was & Z = 2xy C + az Z - 2xy = 0 Let ø=Z-2xy 10 = -2442$ 1 +00 ay

o O = Now, considering these suroface, Now, putting 2 = 2xY Fodra (8 xy² + 2x-3y2) axdy. Tromsforming into polas coordinates8 Fodr sint + 2 sint & + 2 sint -3 (t-sinzt E 8 2 Fodra (0) + 30) 3 (211-0) 15 oo = 11.8 4

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