defence exam DGAFMS Group C 2025 Mock Test Series Quantitative Aptitude Algebra Identities

यदि \(\rm x^2+\frac{1}{x^2}=40\) और x > 0 है, तो \(\rm x-\frac{1}{x}\) का मान क्या है?

1
\(\sqrt{38}\)
2
40
3
\(\sqrt{42}\)
4
\(\sqrt{21}\)
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