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Please show detailed steps of how to evaluate the following integrals.
(1) [e^x - e^(-x)] / [e^x + e^(-x)]dx
(2) 1/[x^(2/3)* (1+ x^(1/3))]dx
(3) 1/[1 + sqrt(2x)]dx
The solution shows how to evaluate the integrals by substitution and integration by parts in detail.