| 47 | 45th LS(200403) 로피탈의 정리(P505)  | jp Park  | 00:34 | 0 |
| 46 | 44th LS(200327) Local Maxima, Minima, Inflection Points(P495.. | jp Park | 2020-03-28 | 0 |
| 45 | 43th LS(200321) Tangent Line(P479) | jp Park | 2020-03-21 | 0 |
| 44 | 42th LS(200320) Differentiation of Inverse Function(P462) | jp Park | 2020-03-21 | 0 |
| 43 | 41th LS(200319) Rules of Differentiation(P449) | jp Park | 2020-03-19 | 0 |
| 42 | 40th LS(200315) Leibniz Notation(P428) | jp Park | 2020-03-15 | 0 |
| 41 | 39th LS(200314) Lmits(P408) | jp Park | 2020-03-15 | 0 |
| 40 | 38th LS(200308) Roots of complex numbers(P393) | jp Park | 2020-03-08 | 1 |
| 39 | 37th LS(200307) Euler Form((P388) | jp Park | 2020-03-07 | 0 |
| 38 | 36th LS(200229) Complex Plane(P377) | jp Park | 2020-02-29 | 0 |
| 37 | 35th LS(200221) Intersecting Planes (P356) | jp Park | 2020-02-21 | 0 |
| 36 | 34th LS(200220) 점과 평면사이의 거리 (P351) | jp Park | 2020-02-20 | 0 |
| 35 | 33th LS(200219) Cartesian Eq of Plane (P347) | jp Park | 2020-02-19 | 0 |
| 34 | 32th LS(200218) Line Classification (P341) | jp Park | 2020-02-18 | 0 |
| 33 | 31th LS(200214) Line Eqs(P330) | jp Park | 2020-02-14 | 0 |
| 32 | 30th LS(200210) Vector Cross Product(P322) | jp Park | 2020-02-11 | 0 |
| 31 | 29th LS(200201) Vector Dot Product(P308) | jp Park | 2020-02-02 | 0 |
| 30 | 28th LS(200131) Vector(P294) | jp Park | 2020-01-31 | 0 |
| 29 | 27th LS(200123) System Eqs using 3X3 Matrix | jp Park | 2020-01-23 | 0 |
| 28 | 26th LS(200118) Inverse Matrix(P327 Ex11) | jp Park | 2020-01-18 | 0 |
