f(x) = \(\rm \left(x+{1\over x}\right)^2 \) అనే ప్రమేయాన్ని అవకలనం చేయండి

1
\(\rm 2\left(x + {1\over x}\right)\)
2
\(\rm 2\left(x - {1\over x}\right)\)
3
\(\rm 2\left(x - {1\over x^3}\right)\)
4
\(\rm 2\left(x+ {1\over x^3}\right)\)

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