If (x + 1/x) = 4, Find the value of :-
1. (x - 1/x)
2. (x square + 1/ x square)
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The atomic number or proton number (symbol Z) of a chemical element is the number of protons found in the nucleus of every atom of that element. The atomic number uniquely identifies a chemical element. It is identical to the charge number of the nucleus.
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