3-D Geometry - JEE mains level

How do you use the symmetric form for JEE level questions? What is the exact meaning of taking symmetric form?Take the below question an example

https://www.doubtnut.com/qna/649670254
Doubtnut
One vertex of a rectangular parallelopiped is at the origin O and the lengths of its edges along x, y and z axes are 3, 4 and 5 units respectively. Let P be t
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