Solving 2 Simultaneous Equations for c & d

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The discussion focuses on solving two simultaneous equations involving the variables c and d, where a and b are known. The equations are defined as a = sin(c) * cosh(d) and b = cos(c) * sinh(d). The user successfully eliminates c to derive the equation (sinh d)^2 = b^2 + (a^2)*(tanh d)^2, and further simplifies it by substituting (tanh d)^2 with 1/(cosh d)^2 and (cosh d)^2 with 1 + (sinh d)^2, ultimately leading to a quadratic equation for d.

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ChrisHarvey
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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.
 
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Arggghhhh... I've just this second seen how to do it: write (tanh d)^2 as 1/(cosh d)^2 and then (cosh d)^2 as 1 + (sinh d)^2, multiply though by (sinh d)^2, and solve as a quadratic.

I have an annoying habit of asking for help and then doing it myself a few minutes later... sorry.
 

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