$x e ^ { 2 y + 1 } + 1 - x = 0$
$\lim_{x\to0}\left(\frac{t}{\sqrt{t+1\:-\sqrt{1+t}}}\right)$
$\int_1^{\infty}\cos\left(x\right)^2dx$
$x^{2+3x+2}$
$5x^3y^2-15x^2y^2-90xy^2+200y$
$\left(7n+4\right)^2$
$x^2+52x+169$
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