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## Main Question or Discussion Point

Can anyone analytically solve these 2 simultaneous equations for c & d, where a and b are known?

a = sin(c) * cosh(d)

b = cos(c) * sinh(d)

I can eliminate 'c' to get:

(sinh d)^2 = b^2 + (a^2)*(tanh d)^2

but this doesn't seem to make life any easier.

a = sin(c) * cosh(d)

b = cos(c) * sinh(d)

I can eliminate 'c' to get:

(sinh d)^2 = b^2 + (a^2)*(tanh d)^2

but this doesn't seem to make life any easier.