Understanding the derivative of the cost function is key to mastering logistic regression. Learn how gradient descent updates ...

So, here are some "rules". I can find the derivative of this function by finding the derivative of g(t) and f(t) in the following manner. I will use this in an example in a short bit. Power rule.

To do that, you have to plot the function on a piece of paper that ... You can read the angle and find the true derivative using a table of tangents. [Chris] has another derivimeter from Gerber.

Proceedings of the American Academy of Arts and Sciences, Vol. 45, No. 12 (Apr., 1910), pp. 339-352 (14 pages) ...