Symbolic Index /sym/ea4bfa
id=1 · host=au.commstar.world · 2026-10-20 14:52Z
∑_{k=1}^{n} k = n(n+1)/2
∑_{k=1}^{n} k = n(n+1)/2
52K
det| 12 5 ; 4 13 | = 136
\oint_C \vec{F}\cdot d\vec{r} = 0
90K
\oint_C \vec{F}\cdot d\vec{r} = 0
91K
H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O
det| 7 4 ; 4 8 | = 40
100K
det| 4 9 ; 7 5 | = -43
\frac{12}{6} \sum_{i=1}^{n} i^{2}
197K
det| 1 1 ; 3 2 | = -1
det| 12 9 ; 3 13 | = 129
\binom{n}{k} = \frac{n!}{k!(n-k)!}
218K
det| 3 8 ; 6 4 | = -36