$\frac{-2x^2-1}{2}+\frac{x-2}{3}\le-x^2+\frac{1}{4}$
$\left(\frac{3}{4}x^4-9xy\right)^2$
$\lim_{x\to1}\left(\frac{x^2+x-6}{x-2}\right)$
$\int e^{x+5}\cdot\left(9x+5\right)dx$
$\frac{x^2-1}{x-2}$
$k-6k$
$15x^2+8x-12=0$
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