© examsiri.com
Question : 73 of 160
Marks:
+1,
-0
Solution:
For
0<x<1,
I‌=∫[tan−1(1−x+x2)+tan−1(1−x)]‌dx‌=∫tan−1[‌| (1−x+x2)+(1−x) |
| 1−(1−x+x2)(1−x) |
]‌dx‌=∫tan−1(‌)‌dx‌=∫tan−1(‌)‌dx‌=∫cot−1(x)‌dx=∫(‌−tan−1x)‌dx‌=∫‌‌dx−∫tan−1x‌dx‌=‌x−[xtan−1x−‌‌ln(1+x2)+C][Using product rule]
=‌x−xtan−1x+‌‌ln(1+x2)+Cwhere
C= constant of integration
‌=x(‌−tan−1x)+‌‌ln(1+x2)+C‌=xcot−1x+‌‌ln(1+x2)+C‌=xcot−1x+log‌√1+x2+C
© examsiri.com
Go to Question: