$ \text{Sa Ri}_2 \text{Ga}_3 \text{Pa Dha}_2 \text{Sa'} $
$ \text{Sa'} \text{Dha}_2 \text{Pa Ga}_3 \text{Ri}_2 \text{Sa} $
$ \text{Pa Dha}_2 \text{Sa'} \ \text{Sa'} \ \text{Sa'} $
$ \text{Dha}_2 \text{Pa Ga}_3 \text{Ri}_2 \text{Sa} $
$ \text{Ga}_3 \text{Ri}_2 \text{Sa Ri}_2 \text{Ga}_3 $
$ \text{Pa Dha}_2 \text{Sa'} \ \text{Sa'} \ \text{Sa'} $
$ \text{Dha}_2 \text{Pa Ga}_3 \text{Ri}_2 \text{Sa} $
Find the interval in which $f(x) = x + \frac{1}{x}$ is always increasing, $x \neq 0$.