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    Hi guys.

    I need help with this question in the C4 book, I can't solve it no matter what I try. Its been posted before but I can't understand the solution.

    Please help!

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    which part? also could you post your workings?
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    (Original post by drandy76)
    which part? also could you post your workings?
    Part i) please, and i havent got very far...only got QRS as alpha, and therefore alpha add theta equals 90 degrees
 
 
 
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