Teaching AWES Army Public School TGT Mock Test 2024 Quantitative Aptitude Algebra Identities

यदि x² + y² = 280 और xy = 120 है, तो (x - y) / (x + y) का मान ज्ञात कीजिए।

1
\(\frac{1}{\sqrt{13}}\)
2
\(\sqrt{15}\)
3
\(\sqrt{13}\)
4
\(\frac{1}{\sqrt{15 }}\)
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