D

D[f, x] gives the partial derivative of f with respect to x.

D[f, {x, n}] gives the nth derivative.

Examples

First derivative:

D[x^3, x]
(* 3 x^2 *)

Second derivative:

D[Sin[x], {x, 2}]
(* -Sin[x] *)

Partial derivative:

D[x^2 y, x]
(* 2 x y *)

Please visit the official Wolfram Language Reference for more details.