Question

if i 1 = int 0 ^ 4 (1 - (1 - x ^ 3) ^ sqrt(2) )^ sqrt 3 x^ 2 dx epsilon i 2 = int 0 ^ 1 (1 - (1 - x ^ 3) ^ sqrt(2) )^ sqrt 3 1 x^ 2 dx, then (l_{1} - l_{2})/l_{2} = 1/k then k is equal to:________