जर \(\rm \left(y^2+\frac{1}{y^2}\right)=167\) आणि y > 0 असेल, \(\rm \left(y+\frac{1}{y}\right)\)चे मूल्य शोधा.

1
13
2
\(-\sqrt{165}\)
3
\(\sqrt{165}\)
4
-13

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