x=acos³x y=asin³t 求d²y/dx²
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x=acos³x y=asin³t 求d²y/dx²
x=acos³x y=asin³t 求d²y/dx²
x=acos³x y=asin³t 求d²y/dx²
d²y/dx²=(y``x`-x``y`)/(x`)^3
y`=3a(sint)^2*cost
y``=6asint*(cost)^2-3a(sint)^3
x`=-3a(cost)^2*sint
x``=6acost*(sint)^2-3a(cost)^3
d²y/dx²=1/(3asint*(cost)^2)
(方法是这样,中间步骤不知道有没有算错)