D

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

Attributes[D] := {Protected, ReadProtected}

Simple examples

In[1]:= D[(2*x^(3)/(2))/(3) + (2*x^(5)/(2))/(5), x]
Out[1]= Sqrt[x] + x^(3)/(2)

In[2]:= D[Log[5*x^2], x]
Out[2]= (2)/(x)

In[3]:= D[Cos[Log[x]], x]
Out[3]= (Sin[Log[x]])/(x)*-1