$x^2-2x+4\le0$

$\int\frac{x-7}{x^2+4x-5}dx$

$63y-43y^3-76y^2+25y+y^3$

$\lim_{x\to2}\:\frac{\left(x^2-1\right)e^{x^2}}{\left(x-2\right)}$

$\frac{2x\sec^2x^2}{\sqrt[3]{9\tan^2x^2}}$

$\frac{1}{x^2}+4x+4$

$-\left(3\right)^2-\left(-3\right)^3\left(-2\right)^2\left(-2\right)$