8t+3r-7t-9r
6/14
15 + (4×3) - 10 ÷ 2 = ____.
[3x³ + 5x² + 3x]₀⁴⁵
56y-y=6
$\frac{\ n! - (n + 1)!}{\ n!}$
3*3-3/3+3=
$\frac{\ n! + (n + 1)!}{\ n!}$
3*3-3//3+3
derivation of solution for cos(x+y)
