wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

The value of dx(x2+1)x equals
(for some arbitrary constant of integration C)

A
12tan1(x12x)+12lnx2x+1x+2x+1+C
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
12tan1(x12x)12lnx2x+1x+2x+1+C
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
tan1(x12x)12lnx2x+1x+2x+1+C
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
12tan1(x12x)122lnx2x+1x+2x+1+C
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
Open in App
Solution

The correct option is D 12tan1(x12x)122lnx2x+1x+2x+1+C
I=dx(x2+1)x
Put x=tdxx=2dt
Then, I=2t4+1dt
=(t2+1)(t21)t4+1dt
=t2+1t4+1dtt21t4+1dt
=1+1/t2t2+1/t2dt11/t2t2+1/t2dt

Now, in the first integral, put z=t1t and in the second integral, put u=t+1t
Then, I=dzz2+2duu22
=12tan1(z2)122lnu2u+2+C
=12tan1(t1/t2)122ln∣ ∣t+1/t2t+1/t+2∣ ∣+C
=12tan1(x12x)122lnx2x+1x+2x+1+C

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Derivative of Standard Functions
MATHEMATICS
Watch in App
Join BYJU'S Learning Program
CrossIcon