$\left(3x+2y\right)\left(3-2y\right)$
$-3y-2-3+17y$
$11y-17-10y-7+5$
$2\left(5-2x\right)^2$
$\cos\left(x-45\right)=-1$
$20-5x$
$\frac{1}{2}\int\frac{2}{u}du$
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