and from diagram we can say that total rotation is 2θ then the restoring moment

iii) Taking Moment equilibrium at point B

From above equation we will get one trivial solution and second solution gives us the critical load

At the critical value of the load the structure is in equilibrium regardless of the magnitude of the angle

**If **** the structure is stable**

**If **** the structure is unstable **

**If **** the structure is neutral equilibrium**

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