$4x\cdot\left(2x^2-3x-4\right)$
$\int\frac{3x}{4x^2+5}dx$
$\int\left(\frac{1}{2}tsin4t^2\right)dt$
$\infty+\frac{11}{12}$
$\cot x+\tan x$
$4y+2x-2y$
$x^2+8x+100$
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