Power Rule for Derivatives/Historical Note

Historical Note on Power Rule for Derivatives
The Power Rule for Derivatives was stated, without proof or explanation, by in his $1684$ article Nova Methodus pro Maximis et Minimis, published in.

had established exactly the same result in a privately circulated paper of $1669$: On Analysis by Means of Equations with an Infinite Number of Terms, by investigation the nature of a function whose area under the graph is $x^m$.