A bridge is modeled by f(x)=cosh(x)f(x) = \cosh(x)f(x)=cosh(x) on [−1,1][-1, 1][−1,1]. What is the arc length?
2sinh(1)2 \sinh(1)2sinh(1)
2cosh(1)2 \cosh(1)2cosh(1)
sinh(2)\sinh(2)sinh(2)
111