Hi, I have a question and the answer but i am slightly uncertain how the answer is achieved and was wondering if someone could please explain it to me.
Q: Using the fact that 2/(e^[2x]+1)=1 - (e^[2x]-1)/(e^[2x]+1)
integrate 1/(e^[2x]+1) with respect to x
A: 1/2{x-ln(e^x+e^-x)}+c
any help would be great thanks
Although perhaps they meant...
And now the top is the derivative of the bottom. So you can do...
... where
... is the chain rule. Straight continuous lines differentiate downwards (integrate up) with respect to x, and the straight dashed line similarly but with respect to the dashed balloon expression (the inner function of the composite which is subject to the chain rule).
The general drift being...
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Don't integrate - balloontegrate!
Balloon Calculus; standard integrals, derivatives and methods
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