Help me evaluate this integral, i am confused
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Help me evaluate this integral, i am confused

[From: ] [author: ] [Date: 12-05-09] [Hit: ]
......
(integral of) - (((sech3x).(sinh3x))/(cosh3x)).dx

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First of all, sinh 3x/cosh 3x = tanh 3x.
So you have to compute
-∫ sech 3x*tanh 3x dx.= 1/3 sech 3x + C.
1
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