1) show that
tanh-1(x) = 1/2 ln (1+x/1-x)
2) show that
a) d/dx (cosh-1(x)) = 1/sqrt x2-1
b) d/dx (tanh-1(x)) = 1/1-x2
3) verify that y = A cosh(3x) + B sinh(3x) is a solution to the equation y''-9y = 0
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