The correct option is D 1√2tan−1(x−1√2x)−12√2ln∣∣∣x−√2x+1x+√2x+1∣∣∣+C
I=∫dx(x2+1)√x
Put √x=t⇒dx√x=2dt
Then, I=∫2t4+1dt
=∫(t2+1)−(t2−1)t4+1dt
=∫t2+1t4+1dt−∫t2−1t4+1dt
=∫1+1/t2t2+1/t2dt−∫1−1/t2t2+1/t2dt
Now, in the first integral, put z=t−1t and in the second integral, put u=t+1t
Then, I=∫dzz2+2−∫duu2−2
=1√2tan−1(z√2)−12√2ln∣∣∣u−√2u+√2∣∣∣+C
=1√2tan−1(t−1/t√2)−12√2ln∣∣
∣∣t+1/t−√2t+1/t+√2∣∣
∣∣+C
=1√2tan−1(x−1√2x)−12√2ln∣∣∣x−√2x+1x+√2x+1∣∣∣+C