You are too small ... to do this. . . . First insert a 0 in the integer interval, and then discuss 0 to 1. Insert a power of 1/4 of t between 0 and1,and take out f by using the integral mean value theorem. The following function can be integrated directly, and then the limit is taken. Because f is continuous, when t approaches 0, it is exactly f(0), and the integral product is PAI/.