Answer: (x-1)^2*(x-3)^2*(x+3)^2
https://www.polymathlove.com/special-polynomials/least-common-measure/lcm-of-polynomials-calculator.html#c=lcm_algstepslcm&v230=%2528x%2520-%25201%2529%255E2%252C%2520%2528x%2520%2B%25203%2529%255E2%252C%2520%2520x%255E%25282%2529-9%252C%2520%2528x-3%2529%255E2