Eqn 13b Help

sinh(z) = ½ (e^z – e^–z) by definition

Substitute z = x/a

The result is sinh(x/a) = ½ (e^x/a – e^–x/a)

cosh(z) = ½

(e^z + e^–z) = ½ (e^z – e^–z) = sinh(z) by definition

Substitute z = x/a

The result is

d(x/a)

cosh(x/a) = sinh(x/a)

a cosh(x/a) = sinh(x/a)

Robin Waddell11 February 1945 – 26 April 2024