Question

In Quantum Mechanics Prove that, (∇x)[sup]2[/sup]=<x[sup]2[/sup]> =<x>[sup]2[/sup]=a[sup]2[/sup]/12(1-6/(n[sup]2[/sup] π[sup]2[/sup] )), where (∇x) is the uncertainities in the position of a particle in motion.