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 Discussion Response Post to:
frefrew
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Message |
![[Post New]](/templates/default/images/icon_minipost_new.gif) 22 Apr 2008 21:47:07 IST
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ans 4) integral dx / (1 + ex)(1 - e-x)
= dx / (1 + ex)(1 - (1/ex))
= exdx / (1 + ex)(ex - 1)..................just taking the LCM
= exdx / (e2x - 1)...................(a+b)(a-b) = a2 - b2
now put ex = t , exdx = dt
it becomes
dt / t2 - 1
now its easy
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this reply: 10 points
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