$4t^2+9t^4$
$x^2-17x-30$
$9y^2-81x^2$
$\sqrt{x}^x$
$\int2x\sin^2\left(x\right)dx$
$\lim_{x\to0}\left(\frac{cos\left(8x\right)-cos\left(6x\right)}{x^2}\right)$
$\lim_{x\to\infty}\left(\frac{-6x-17}{5x^2+2x-2}\right)$
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