In this note, we prove an extension of a known elementary geometric result in two ways, i .e ., synthetically and by complex numbers. Then we show that the result characterizes closed curves of… Expand

During of the school year an instructor asked 2022 problems in the class and the number of students who could not solve any particular problem was at most two. The instructor wants to divide the 2022… Expand

Calculus provides us with systematic, general, and powerful methods for attacking extremum problems. Because of its generality, there are often simpler methods for solving specific problems. These… Expand