For each of the following functions (i) give a definition like those in (2), (ii) sketch the graph, and (iii) find a formula similar to Equation 3. \text { a)

} \operatorname{csch}^{-1} \text { (b) } \mathrm{cech}^{-1} \text { (c) } \operatorname{coth}^{-1}