Question

高数怎么做？

帮帮我！！！

Answer 1

一阶导数好办，y'(t)=sint, x'(t)=1-cost, 所以y'(x)=y'(t)/x'(t)=sint/(1-cost).
当t=pi/2时，y'(x)=1.
二阶导数就容易搞胡涂了。记f(x)=y'(x)=sint/(1-cost)=f(t), 则f'(t)=[cost-(cost)^2-(sint)^2/(1-cost)^2=(cost-1)/(cost-1)^2=1/(cost-1).
f'(x)=y"(x)=f'(t)/x'(t)=-1/(1-cost)^2.
当t=pi/2时，y"(x)=-1.

Answer 2

dy/dx = y't/x't = sint/(1-cost) = 1 at t = pi/2
d^2y/dx^2 = [sint/(1-cost)]'t/x't = [cost(1-cost) - sin^2t]/(1-cost)^3 = -1 at t = pi/2

Answer 3

我不会，没有学好

Answer 4

高数怎么做？我来答，到百度知道平台搜索一下，能找到专业高数老师指导帮助提高数学水平。

Answer 5

高数非常难，要从基础做起，一步一步慢慢来。

Answer 6

如果你实在不会你可以请教你的老师就好了