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FP3 Polar Co-ordinates - Help Please !!

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    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
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    perhaps this might help....
    Attached Files
  3. File Type: pdf Polar Coordinates Problem.pdf (34.6 KB, 51 views)
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    (Original post by mikelbird)
    perhaps this might help....
    PRSOM!

    One thing, I don't get how BO =  a(1+\cos (\pi + \phi)).
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    (Original post by member910132)
    PRSOM!

    One thing, I don't get how BO =  a(1+\cos (\pi + \phi)).
    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!!
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    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
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    OK..written in a hurry but cos phi minus pi is also minus cos phi so the result stands...sorry about the confusion
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    (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

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