OrnaVerum
v 6.30.00
28 Jan 2022
updated 28 Jan 2022

Eqn 14e Help

d
dz
sinh(z) = ½
d
dz
(ez – e–z) = ½ (ez + e–z) = cosh(z) by definition

so ∫ cosh(z) dz = sinh(z)

Putting z = x/a,∫ cosh(x/a) dx = a sinh(x/a)