cosec(x) 上的 SymPy diff function 正在返回 Derivative(cosec(x),x)

Question

Here is the code that I wrote:

print(diff("cosec(x)","x"))

The output I got is: Derivative(cosec(x), x)

What is up with this and how do I actually get the derivative of cosec(x)?

Answer 1

You should define the symbol x :

x = Symbol('x')

then you can obtain the derivative as

diff(csc(x),x)

As you can see the name of cosecant function is csc