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x=lnsint y=cost+tsint的二阶导数d^2y/dx^2
人气:128 ℃ 时间:2020-06-23 01:00:06
解答
解题须知:dy/dx = y'(t) / x'(t)设:z = dy/dxz= dy/dx= y'(t) / x'(t)= t Cos(t) / Cot(t)= t Sin(t)dz/dx= z'(t) / x'(t)= (t Cos(t) + Sin(t)) / Cot(t)= Sin(t) (t + Tan(t))所以 d^2y/dx^2 = Sin(t) (t + Tan(t)...
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