$7m+10+9m$
$2xe^{-x}-x^2e^{-x}$
$z^2-2z+4$
$-10d+8\left(-10d+10\right)$
$\lim_{x\to\infty}\left(\frac{\left(-\pi\right)^x}{5^x}\right)$
$3\tan^2a-1=1$
$\left(y^2+1\right)senxdx-ycosxdy=0$
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