(a) [5 pts.] Show that the curve a(t) = (cosht, sinh t, t) has arclength function et + e-t et e s(t) = 2 sinh t, where cosh t = and sinht = 2 (b) [5 pts.] Show that sinh x = ln(x + x + 1). (c) [5 pts.] Find an arclength parameterization for a. 2