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cylindrical polars Q2 of TeeEm's questions

In question 2 of the cylindrical polars questions in the thread created by TeeEm, why does the squared in the (x+y+z)^2 disappear in the solutions at the start?



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Zacken
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Original post by madmadmax321
In question 2 of the cylindrical polars questions in the thread created by TeeEm, why does the squared in the (x+y+z)^2 disappear in the solutions at the start?



Thank you


You'll need to link the question or put up a picture of it.
Original post by Zacken
You'll need to link the question or put up a picture of it.


its cylindrical polars 2 http://www.thestudentroom.co.uk/showthread.php?t=3349661
Original post by madmadmax321

He wrote down one problem and solved another. It's a mistake.

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