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Dr suman 1
the answer will be zero.
I think there has been a mistake. You have performed rather than ∆x which is the standard deviation and is always non zero for Gaussian wavefunctions . Gaussian wavefunctions always give minimum uncertainty product that is hbar/2 where hbar=h/(2*pi) i.e reduced Planck's constant.
See Modern Quantum Mechanics by Sakurai ,page no - 56 to 58