Thursday, 1 April 2010


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!


  1. Sure it's neat and all, but what are the actress's names?

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  3. I'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

  4. My 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.

  5. I think that's a lowercase t, just sloppy handwriting.

  6. Dodger - Either way it's a mark dropped.

  7. Sure the trig's all correct, but what kind of teacher's outfit is that??!

  8. Actually '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.

  9. I thin EDW Lynch can apply for the world record for analysing the porn films, blackboards, class rooms, teachers and students in porn film stories.

  10. pippin101 - My style guide says "plural 'formulas', but 'formulae' in a scientific context".

  11. pippin101 - I agree that it is a grey area though. Perhaps you would like to weigh in on the math/maths argument raging around post #5?

  12. Where can I sign up to this class ?

  13. 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.

    BTW I subed to this blog.

  14. 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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