Let f (x) = tanh(x). Giventhat f(x)=sech2(x), useChainRuletohelpfind f(x).

b) Use your calculator (or computing software) to help find the approximate values of f (x), f '(x), and f ''(x) when x = 2 . (report each correct to four decimal places)

3a) Let g(x) = sinh-1(x), the inverse Hyperbolic Sine function. Write down the "ln" form of this function, then use it to show what the exact

value of g(x) is when x = -1. b) Identify g'(x), then find the exact value of g'(x) when x = -1.