$\int e^{2x}\cdot\cos\left(3-5x\right)$
$-3\left(4y+6\right)-9y$
$x^2-3x-5$
$\int^2\left(x^2+5x+6\right)dx$
$x^2=4z$
$-70mn+25n^2$
$\sqrt{20}.\sqrt{8}$
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