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    I'm working through all the trig stuff on examsolutions.net and I'm now up to this video. It's about proving trig identities using these 'factor formulae', but I don't remember ever hearing about them or seeing them before. Having I missed something, is it a part of an earlier unit? Or is this not on our spec?
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    http://www.trigonometry-help.net/trig-formulas.php contains these formulae.
 
 
 
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