> >The method that you will learn about in calculus is the Leibniz method. > >arctan(pi / 4) = 1, so you can calculate pi using a definite integral. > > In the other emails, I saw this 'arctan' too. Where can I find it on my > calc? > try tan^-1, that's what it's called (but it isn't tan(x)^-1 !!) on most calc's