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Find the derivative of f(t) = csch t (1-ln csch t)

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You need to use the product rule to find the derivative of f(t) such that:

`f'(t) = (cosech t)'(1 - ln cosech t) + (cosech t)(1 - ln cosech t)'`

`f'(t) = cosech t*cotanh t*(1 -...

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