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Walter Roberson
on 21 Dec 2019

F = @(theta_k) (theta_k .* sqrt(1+theta_k.^2) + asinh(theta_k)) - ( (theta_j .* sqrt(1+theta_j.^2) + asinh(theta_j)) + (theta_i .* sqrt(1+theta_i.^2) + asinh(theta_i)));

guess = rand();

fsolve(F, guess)

Walter Roberson
on 22 Dec 2019

What are the initial values for theta_i and theta_j ?

Perhaps you did not define theta_i and theta_j before you defined F.

If you are trying to find a symbolic form for theta_k in terms of unresolved variables theta_i and theta_k then you are not going to be able to do that, at least not in a closed form.

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