Hey, In the conics topic, if part of a question requires use of e.g. a tangent or a normal, are we required to derive the formula from scratch or can we just quote the standard form (e.g. x.x1/a^2 + y.y1/b^2 = 1 for the tangent to an ellipse) and go from there? I have been under the impression that, even if it doesn't explicitly state it, we are required to derive the formula; but i want to be sure as it could save some time in the exam if i'm mistaken.
-
Want to help us with this year's BoS Trials? Let us know before 30 June. See this thread for details -
Looking for HSC notes and resources? Check out our Notes & Resources page
Conics: deriving tangent/normal (1 Viewer)
- Thread starter Mr-Morten
- Start date
Dumbledore
Member
- Joined
- Sep 11, 2008
- Messages
- 290
- Gender
- Male
- HSC
- 2009
unless it says "you may assume ...etc" then u have to derive it for tangents and normals
for chord of contact, u can state it unless it asks u to prove it
for chord of contact, u can state it unless it asks u to prove it
kwabon
Banned
derive derive derive unless it says assume, dumbledore is quite right, but unfortunately HE IS DEAD!!! :-(
annabackwards
<3 Prophet 9
HP fan right here XD