A
B
C
a
b
c
r
y
x
h
r
y
x
x = (−b ± √(b² − 4ac)) / 2a
Σ k = n(n + 1) / 2
A = πr² · C = 2πr
E = mc²
sin²θ + cos²θ = 1
V = s³
V = ⅓πr²h
y = ax² + bx + c
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