Question

maple 隐函数 求导例如对 x^2-y^2 = 9 这样的函数,diff(x^2+y^2 = 9 ,x) 的结果是

Answer 1

dy/dx = implicitdiff(x²+y² = 9,y,x);

dy x

-- = - -

dx y

> dy/dx = implicitdiff(x²+y² = a,y,x);

dy x

-- = - -

dx y

diff 用于显函数求导,隐函数求导应该用 implicitdiff(f,y,x)