Mathematically proving the derivative with respect to x of the function ln(x), where ln is the logarithm base “e” (the approximately 2.718… constant).
By João Marcos Vensi Basso.
That is Brilliant website: http://thatisbrilliant.org/
Facebook page: http://on.fb.me/1j6wQMn
Isso é Genial (Portuguese version): http://issoegenial.com/
Isso é Genial on Facebook: http://on.fb.me/1ia4NYp