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% pm plus minus ±.
Syntax: $ \int _{a}^{b}f(x)d(x). \$ \$ x= \frac {-b \pm \sqrt {b^2-4ac}}{2a} \$
Output: $\int _{a}^{b}f(x)d(x).$ $x= \frac {-b \pm \sqrt {b^2-4ac}}{2a}$
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