E
Editor
Sep 18, 2022
(\frac{1}{x}+x)^2-(\frac{1}{x}-x)^2=?
Difficulty: Easy
A:
4
B:
2
C:
2(\frac{1}{x^2}+x^2)
D:
2(\frac{1+x^2}{x^2})
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ID: 63273db5ca83163ac3a0a06d