# News

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## More revision cards!

I'm currently overhauling my set of revision cards (of which 24 are available on the site), when complete, there should be a set of 100.

## Instagram problem

The solution to the instagram problem can be found here

## Complex Numbers

I've just started adding some basic complex numbers content to the site (definitely feel I've done this before!) My current plan is to add the following content.

## A simple pendulum

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

## Small angle approx

approximations to sin(x), cos(x)

## 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!

## Early days

We're massively overhauling the site!

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