The chain rule is a method of differentiating a function within a function, for example $\sin x^2$. If you have studied maths to a sufficien...

This is an interesting STEP question (as many of them are!) but it gets you to, unwillingly, prove some interesting properties of triangles....

If you have standard maths to a pre-undergraduate level then it is pretty likely that you have met the product rule for differentiating two ...

I feel I needed an updated post on the Fibonacci sequence with some of the more core ideas behind it, you can still access the old post . ...

Did you know that if a number is divisible by 3 then the sum of its digits are also divisible by 3? Have you ever wondered why? The answer t...