Compound Angle Formulae
sin (A + B)
= sin A cos B + cos A sin B
cos (A + B)
= cos A cos B - sin A sin B
tan (A + B)
= tan A + tan B
1 - Tan A Tan B
A-level standard trigonometry. Maths all correct. Good pluralisation of 'formulae'. Neat handwriting. Loses a mark for 'Tan' instead of 'tan'. But otherwise: excellent work!
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ReplyDeleteI'd observe that A and B are not an usual way to symbolize angles, it's much more common to use alpha and beta from greek alphabet, so a 9/10 is a bit too much imho
ReplyDeleteMy A-level formula book uses A and B, (AEB GCE A and AS level Formulae and Statistical Tables, 1994 version). It might be a UK thing.
ReplyDeleteI think that's a lowercase t, just sloppy handwriting.
ReplyDeleteDodger - Either way it's a mark dropped.
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ReplyDeleteSure the trig's all correct, but what kind of teacher's outfit is that??!
ReplyDeleteActually 'formulae' is not correct. Although it's a Latin word and its original plural was like that, the word has been used in English for so long that it is fully naturalised now and the English plural 's' should be preferred.
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ReplyDeletepippin101 - My style guide says "plural 'formulas', but 'formulae' in a scientific context".
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ReplyDeleteIt looks like she has written sun(A+B) instead of sin. Also I would have highlighted that greek letters of the beggining of the greek alphabet are more used for angles than latin letters. I would have given them a 8/10.
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It looks like she has written sun(A+B) instead of sin. Also I would have highlighted that greek letters of the beggining of the greek alphabet are more used for angles than latin letters. I would have given them a 8/10.
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