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二次方程式 $ax^2 + bx + c = 0$ の解は、 $$ x = \dfrac{-b \pm \sqrt{b^2 - 4ac}}{2a} $$ で得られる。

$$\sum_{k=1}^{\infty} \frac{1}{k^2} = \frac{\pi^2}{6}$$

$a^2+b^2=c^2$