$y^2+6y^3-8-2y^4-3y^2+6y$
$\left(2x+1\right)-2$
$\lim_{x\to0}\left(\frac{-x}{tan\left(x\right)}\right)$
$x+5>4$
$- \frac { 9 x } { 3 x ^ { 2 } }$
$16+40a-14a$
$4x^4\cdot5x^5$
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