interactivity
Round and round a circle
Can you explain what is happening and account for the values being
displayed?
Trigonometric identities
article
Why stop at three by one
Beautiful mathematics. Two 18 year old students gave eight
different proofs of one result then generalised it from the 3 by 1
case to the n by 1 case and proved the general result.
article
What are complex numbers?
This article introduces complex numbers, brings together into one
bigger 'picture' some closely related elementary ideas like vectors
and the exponential and trigonometric functions and their
derivatives and proves that e^(i pi)= -1.