I have the equation y = 1/k * ln(cosh(SQRT(g*k)*t))

My goal is to solve for k. This is for aerospace engineering and "k" includes a variable that I need.

I have rearranged two ways already:

1) k = (acosh^{2}(e^{yk}))/(g*t^{2})

2) k = ln(cosh(SQRT(g*k)*t))/y

I have NO IDEA as I am only a freshman. How do I get k to a single side? I would greatly appreciate help with this.

Best regards,

Dwight