[member910132]

http://store.aqa.org.uk/qual/pdf/AQA-MFP3-TEXTBOOK.PDF

Q 5bi and 5bii on page 52 please, I got the rest correct.

I know I am expected to show some working before asking for help, but I am completely stumped by how I am to prove AB is a constant and then find a polar equation for M (mid point of AB).

Thnx

[mikelbird]

perhaps this might help....

[member910132]

(Original post by mikelbird)
perhaps this might help....

PRSOM!

One thing, I don't get how BO = .

[mikelbird]

(Original post by member910132)
PRSOM!

One thing, I don't get how BO = .

Because AB is a straight line going through O so if the angle for OA is phi radians then surely the angle for B is phi plus pi radians....OK!!

[member910132]

I thought it would be pi take phi if it's on the other side of the straight line.


This was posted from The Student Room's iPhone/iPad App

[mikelbird]

OK..written in a hurry but cos phi minus pi is also minus cos phi so the result stands...sorry about the confusion

[member910132]

(Original post by mikelbird)
OK..written in a hurry but cos phi minus pi is also minus cos phi so the result stands...sorry about the confusion

Np, I appreciate you going out your way to make the pdf and your time