In maths we used to use 'Soh Cah Toa Soc' for sine = opposite over hypotenuse, cosine = adjacent over hypotenuse, tangent = opposite over adjacent and sine over cosine = tangent. For some reason it worked well and has stayed with me.

It would be interesting to know why some things work and some don't. Has anyone done a study on it? Or is that WW's plan in addition to cornering the market in ukeleles (there was a great Jeeve's and Wooster book where the plot revolved about Bertie playing a uke, and Jeeves resigned in protest, must look it up).