Hmmm. You know, maths is a lot harder than it used to be. Or maybe I’m just not as bright. Probably the later
where 
Time to refresh my memory of trig identities.
(Disclaimer: this post mainly exists as wordpress was the most convenient latex editor and I wanted to make a note of my equation so I don’t forget, and if you know me, you’ll know that my hand writing is pretty bad at times. So is my grammer).
In other, more exciting news, I have a gig this week.
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