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Homework Statement
Let P1 be the plane passing through the point A(5,6,7) parallel to the xyplane. Write down the coordinates of the point D on P1 which is closest to C(1,3,4).
Homework Equations
None.
The Attempt at a Solution
I am not sure how to attempt this problem. I tried sketching a diagram (attached), but didnt know what else to do.
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