How to calculate derivative at a point?

[Trần lê duy]

Example

Derivative (y = x^2 + 1; x = 1) -> (y)' = 2x = 2 * 1 = 2

I found the derivative here

https://bitbucket.org/axelclk/symja_android_library/src/975765f361867bf676701f2c26f1c0a6e7a7d2bf/symja_android_library/doc/functions/D.md?at=master&fileviewer=file-view-default

But it does not seem to have this feature. Can you add a function?

[Axel Kramer]

With commit 81c777e your example now returns 0.

>> y = x^2 + 1; x = 1
1

>> y'
0&

>> y'(x)
0

[Axel Kramer]

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