$-\frac{3^2-9}{6-4^2}$
$2+0+1$
$x2+7x+6x$
$-\left(-2-6\right)-\left(-4-8\right)$
$-20y+90z=-440$
$xycot\left(xy\right)=ysen\left(x\right)+ysen\left(\frac{1}{y}\right)$
$\int2\sin\left(2x+3\right)dx$
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