INTEGRAL CALCULUS-548 Posted on October 3, 2021 by ssmrmh Proposed by Vasile Mircea Popa-Romania INTEGRAL CALCULUS-548 Solution 1 by Togrul Ehmedov-Azerbaijan, Solution 2 by Hikmat Mammadov-Azerbaijan, Solution 3 by Adrian Popa-Romania, Solution 4 by Fao Ler-Iraq