This is a pdf file of a simple list of trig formulae you should probably know off by heart
It appears to me that many people don't have a good idea what trig formulae they need so I made a simple list - it should be in most maths books - for the benefit of those who have never seen such a list before. Again, the best way to tackle trig is understanding where the formulae came from and have a good idea of how to manipulate and convert them - something that can only be achieved through practise.
15th January: Edited to include t-results - they are very easily derived, and Ext I students should know them off by heart
P.S. the old one - I accidentally deleted the attachment, couldn't attach unless I start a new thread
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---- and yes, is stickied, as useful.