# News

## A simple pendulum

The equations of motion of a simple pendulum can easily be derived using Newtonian physics.

## New statistics materials

I'm currently on a big statistics drive - adding notes on the Poisson, Normal and t-distributions.

## Do I need an account?

Almost all the content is visible to anonymous users!

## New content

I've just added some materials covering the expected value of a discrete random variable.

## The first news article

This is the first news article on the site. It doesn't tell us all that much, just gives a bit of text and commentary to play with and an image.

## Random Reddit Question Part 2

Part 2 was to calculate the second derivative - the tricky aspect was evaluation of $\frac{dt}{dx}$

## Random Reddit Questions

The reddit question was, given that

$$x = t + \ln(\cosh t),\; y = \sinh t$$

Show that $$\frac{dy}{dx} = e^{-t}\cosh^2(t)$$