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a
π
b
2π
c
3π
d
4π
answer is A.
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Detailed Solution
Let I=∫−ππ xsinxdxex+1-----(1) Using property IV, we replace x by 0−x or −x∴ I=∫−ππ (−x)sin(−x)dxe−x+1=∫−ππ exxsinxdxex+1-----(2) Adding equations (1) and (2), we get 2I=∫−ππ ex+1 xsinxdxex+1 2I=∫−ππxsinx dx=2∫0π xsinxdx I=∫0π xsinxdx I=∫0π (π−x)sin(π−x)dx I=∫0π πsinxdx−I 2I=π-cosx0π 2I=2π