Appendix B of the subject content document details the formulae and identities which students must be able to use for AS and A level mathematics; these need to be known. Formulae and identities could be provided but only where they are for example the starting point for a proof or as a result to be proved.
Some students may have seen the excellent credit card size information sheet full of mathematical formulae from Loughborough University. This is also available as a free app for your mobile phone.
An online version is also available.
