Find the length of the arc of y=cosh(x)y = \cosh(x)y=cosh(x) from x=0x=0x=0 to x=ax=ax=a.
sinh(a)\sinh(a)sinh(a)
cosh(a)\cosh(a)cosh(a)
aaa
sinh(a)+a\sinh(a) + asinh(a)+a