$\frac{-x^4+10x^2+2x-2}{x+3}$

$\left(y-2\right)\:\left(y+5\right)=\left(2y-1\right)\left(y+1\right)+7$

$1\:-\:2\:sin^22x$

$500\cdot18$

$\left(x+a\right)^2=x^2+2\cdot\left(x\cdot a\right)+a^2$

$\left(2-x\right)\left(x-3\right)\le0$

$\int\frac{3x^{2}+7x+2}{2x^{2}-x-6}dx$