$81x^2-180x-100$
$\lim_{x\to\frac{\pi}{2}}\left(15\tan\left(x\right)\right)^{15\cos\left(x\right)}$
$\frac{1}{2}\left(x^2+6x+9\right)-4=0$
$4x-16$
$2x-2\sqrt{3x^2}+2$
$\lim_{x\to\infty}\left(x^3-3x^2\right)$
$x^2+x^2\ln\left(x\right)$
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