(36-x^2)^(1/2) 是哪一个的导数
来源:百度知道 编辑:UC知道 时间:2024/05/22 13:05:36
(36-x^2)^(1/2)是哪一个的导数,就相当于求(36-x^2)^(1/2)的积分。过程如下:
∫(36-x^2)^(1/2) dx
= 6∫[1-(x/6)^2]^(1/2) dx
= 36∫[1-(x/6)^2]^(1/2) d(x/6)
设x/6 = sint,则d(x/6) = costdt,[1-(x/6)^2]^(1/2) = [1-(sint)^2]^(1/2) = cost得
36∫[1-(x/6)^2]^(1/2) d(x/6)
= 36∫(cost)^2 dt
= 18∫(1+cos2t) dt
= 18[∫dt + 0.5∫cos2td(2t)]
= 18(t + 0.5sin2t) + C
= 18(t + sintcost) + C(C为任意常数)
由于sint = x/6,因此t = arcsin(x/6),cost = [1-(x/6)^2]^(1/2) = (36-x^2)^(1/2)/2
得18(t + sintcost) + C
= 18[arcsin(x/6) + x(36-x^2)^(1/2)/36] + C
= 18arcsin(x/6) + x(36-x^2)^(1/2)/2 + C
即f(x) = 18arcsin(x/6) + x(36-x^2)^(1/2)/2 + C 的导数f'(x)为(36-x^2)^(1/2),其中C为任意常数。
(36-x^2)^(1/2) 的导数是x=根号(36-y^2)
你把它积分就得了,不过我也有点搞不清楚怎么积了
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