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    https://b3755649dbd1afe3db91a899c3b9...%20Edexcel.pdf

    Q7c) Why can't I have 1 MINUS root x-4 ?

    Q4b)
    I got the answer, however, I used trial and error...
    Mark scheme does it algebraically:
    -1 = a+b
    -5 = a-b
    Why does the first equation have a +
    and the second equation has a -
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    (Original post by ps1265A)
    https://b3755649dbd1afe3db91a899c3b9...%20Edexcel.pdf

    Q7c) Why can't I have 1 MINUS root x-4 ?

    Q4b)
    I got the answer, however, I used trial and error...
    Mark scheme does it algebraically:
    -1 = a+b
    -5 = a-b
    Why does the first equation have a +
    and the second equation has a -
    7c Because for the inverse function to exist, f(x) must be one-to-one so f^{-1}(x) can only have one value

    4b \text{cosec}\frac{\pi}{2}=1\text  { and }\text{cosec}\frac{3\pi}{2}=-1
 
 
 
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