$4x^4+36x^2+81$
$\lim_{x\to\infty}\left(\frac{1}{e^{2x}}\right)^{\frac{-1}{x}}$
$x4-2x^2-1$
$\frac{x+1}{x-6}>7$
$1.21-3+-7.9$
$\int\left(y+5\right)^2dy$
$2-4\sin x=0$
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