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    I haven't got a clue where to start on this question....

    Find the coordinates of the foot of the perpendicular from the point (-2,7,3) on to the line r = 2i - j + 3k + s(j - k)

    (the question is taken from the OCR P3 Book page 175 and the answer is (2, 3, -1) )
 
 
 
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