$x^2\left(1-y\right)+y^2\left(1-y\right)$

$xy^4-y^4x^2=80x^2-3y^4x^5$

$\int_{\frac{\pi}{2}}^{\pi}\csc^2\left(x\right)dx$

$\left(x+1\right)\left(x+3\right)>0$

$\int x ^ { 4 } ( x ^ { 3 } + 8 x ^ { 2 } + 7 ) d x$

$\lim_{x\to\infty}\left(\frac{1-2^x}{3^x}\right)$

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