| 76 | 76th LS(210820) Polar Coordinate (PDF 788) | Jp Park  | 2021-08-21 | 1 |
| 73 | 73th LS(210714) Ch9.4 Mathematical Induction (PDF P679) | Jp Park | 2021-07-15 | 1 |
| 72 | 72th LS(210625) Ch9.2 Arithmetic Sequence (PDF P654) | Jp Park | 2021-06-26 | 1 |
| 71 | 71th LS(210618) Ch8.4 Determinant of Square Matrix (PDF P608.. | Jp Park | 2021-06-19 | 1 |
| 67 | 67th LS(210511) Ch6.5 Trigonometric form of a Complex Number.. | Jp Park | 2021-05-12 | 1 |
| 65 | 65th LS(210420) Ch6.1 Sine Law (PDF P436) | Jp Park | 2021-04-21 | 1 |
| 64 | 64th LS(210415) Ch5.4 Sum and Difference (PDF P399) | Jp Park | 2021-04-16 | 1 |
| 57 | 57th LS(210209) Ch2.2 Polynomial Functions of Higher Degree(.. | Jp Park | 2021-02-10 | 1 |
| 56 | 56th LS(210202) Ch1.9 Inverse Functions(PDF P96) | Jp Park | 2021-02-03 | 1 |
| 55 | 55th LS(210126) Ch1.4 Functions(PDF P53) | Jp Park | 2021-01-27 | 1 |
| 54 | 54th LS(210119) Ch11 끝까지 | Jp Park | 2021-01-20 | 1 |
| 53 | 53th LS(210112) Ch11.1 Using Normal Distribution(P602) | Jp Park | 2021-01-13 | 1 |
| 52 | 52th LS(210105) Ch11.1 Using Normal Distribution(P598) | Jp Park | 2021-01-06 | 1 |
| 51 | 51th LS(201222) Ch10.5 Permutation and Combination(P574) | Jp Park | 2020-12-23 | 1 |
| 50 | 50th LS(201215) Ch10.2 Independent & dependent Events(P552) | Jp Park | 2020-12-16 | 1 |
| 44 | 44th LS(201027) Ch8.4 Finding Sums of Infinite Geometric Ser.. | Jp Park | 2020-10-28 | 1 |
| 43 | 43th LS(201020) Ch8.2 Atithmetic Sequence(P424) | Jp Park | 2020-10-21 | 1 |
| 39 | 39th LS(200915) Ch6.5 Properties of Log(P330) | Jp Park | 2020-09-16 | 1 |
| 37 | 37th LS(200901) Ch6.1 Exponential Growth and Decay(P299) | Jp Park | 2020-09-02 | 1 |
| 35 | 35th LS(200818) Ch5.3 Graphing Radical Functions(P254) | Jp Park | 2020-08-19 | 1 |
