แต่ก่อนมีการค้นพบบันทึกเกี่ยวกับ co

But before the log was found on the corner of the pyramid's cotangent.And all 3 of the right-angled triangle on the table when the two sides of a right triangle.To make known the plaintiff since then, developing education, and so on until it can be applied to knowledge-based, and as we restart the yonchon.

Before the discovery of notes on the cotangent of the angle of the pyramid and the 3
table of triangle over the scene. The grid when defining aspects of 2 sides of a right-angled triangle
.To know the 3 since then it has studied and developed from the information that can be applied to use. And compiled knowledge we learn to present
.