$4ab+13bc$
$\int_{\pi}^{\pi}sen\left(x\right)dx$
$1-2\cdot3^2$
$\left(m+2n\:\right)^2\:-\:\left(m\:-2n\right)^2$
$2\left(-1\right)^3-10\left(-1\right)^2+2\left(-1\right)-10$
$b5xb6$
$\frac{x}{2\sqrt{a^2+x^2}}-\sqrt{a^2+x^2}$
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