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    Hi, stuck on this question (ii)

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    I know this is probably ridiculously easy but cannot for the life of me work out how letting f(a) = 5 is the right solution. I can do parts i and iii (the hard ones lol).

    Would really appreciate someone putting me out of my misery, its driving me crazy. An explanation would be great.

    Thanks,

    Tom
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    Its just hit me ffs. Though BC was horizontal.
 
 
 
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