$x^2-28x+49$

$\frac{\left(6x^3\right)^2}{\left(2x^2\right)^3}.\left(3x^2\right)^0$

$\int\frac{x^3-3x+4}{\left(x+3\right)^2\left(x+1\right)}dx$

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

$\lim_{x\to3}\frac{x-3}{x^2+9}$

$\frac{d}{dx}\frac{1}{1+x^2}+\left(\frac{2x}{1+x^2}+arctanx\right)arctanx$

$-263=-x-45$