In Heisenberg's uncertainty principle
The expression:∆x×∆p(>or=)h/4π or h/2π
Which is correct?

According to the Heisenberg’s Uncertainty principle correct formula is

ΔxΔp≥ ℏ/2

here ℏ value is h/2π so the equation become ΔpΔx≥h/4π

This equation explains the position and momentum of the particle in which either one can be calculated from this formula