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    In one of the proofs in the edexcel C3 text book, (if you have this book please turn to page 107 for a better idea of what is confusing me as i dont know how to post the picture), so the addition formula proof for cos(A-B) -congruent to- cosAcosB + sinAsinB
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    Fr the diagram it seems that its should be cos (B-A) as b is the larger angle.
 
 
 
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Updated: March 28, 2011
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