A long chain is tied tightly between two trees and a horizontal force (F_{0}) is applied at

Question:

A long chain is tied tightly between two trees and a horizontal force $F_{0}$ is applied at right angles to the chain at its midpoint. The chain comes to equilibrium so that each half of the chain is at angle $\theta$ from the straight line between the chain endpoints. Neglecting gravity, what is the tension in the chain?

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