Examples where derivatives are used (outside of math classes) I want to know what is the use of derivatives in our daily life. 
I have searched it on google but i haven't find any accurate answer. I think it is mostly used in Maths but I want to know its use in other departments i.e physics, chemistry, biology and economics.

"... the drop in the economic growth rate decreased..."
may not be worth a headline, but it's an example of third derivatives within economics. 
