Bits of mathematics

My name is Koko and I will teach you how to make silly faces
An approach to trigonometry that won Lester Ford Award in 2010
trigonometric tables rational approximations (1 page)
I wander, I wonder it's very simple but
easy to see simple geometric facts
An ad and a counter-ad of the Calculus
the Fermat point many drawings instead of one
Chinese Remainder Theorem yes, it is geometry
an exercise on  S3 S3 is a many-splendered thing
Groups of order 12 is there anything to talk about?
quotations on maths and other langs
on "Math Landscapes" personal entry to my 2001
compilation of Internet maths