Implicit Differentiation (1 Viewer)

[deadpatch]

Are you allowed to use implicit differentiation in 3U?
What about other 4U methods like using complex numbers to get those triple angle formulae?

 

[Sy123]

Are you allowed to use implicit differentiation in 3U?
What about other 4U methods like using complex numbers to get those triple angle formulae?

You will never need to use it, TECHNICALLY you can use 4U knowledge but it is heavily disliked (you may lose a mark) and there is most likely a much easier way to do it using normal ways.

 

[Trebla]

You are allowed to. However, the HSC exam questions are almost always designed so that no one should resort to it, otherwise it would disadvantage the 3U only students. For example, for things like deriving triple angle formulae you would be told explicitly to derive it using some 3U method (compound angles). If you opt for a different method to the method that the question asks for then you will lose marks. If the question was dodgy and didn't specify what method to use to prove the result, then the complex numbers approach would be acceptable.