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令 x-5 = 4sint, 则 x = 5+4sint,
I = ∫(5+sint)(4cost)^2dt
= 80∫(cost)^2dt +16∫sint(cost)^2dt
= 40∫(1+cos2t)dt -16∫(cost)^2dcost
= 40t + 20sin2t - (16/3)(cost)^3 + C
= 40arcsin[(x-5)/4]+(5/2)(x-5)√[16-(x-5)^2]-(1/12)[16-(x-5)^2]^(3/2)+C
I = ∫(5+sint)(4cost)^2dt
= 80∫(cost)^2dt +16∫sint(cost)^2dt
= 40∫(1+cos2t)dt -16∫(cost)^2dcost
= 40t + 20sin2t - (16/3)(cost)^3 + C
= 40arcsin[(x-5)/4]+(5/2)(x-5)√[16-(x-5)^2]-(1/12)[16-(x-5)^2]^(3/2)+C
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