$8\tan^2x-8\tan^2x\sin^2x$

$\int x\left(x^2e^x-2xe^x+2e^x+c\right)dx$

$\int\left(\left(x+2\right)\left(x^2+4x+2\right)^5\right)dx$

$2\left(y-4x^2\right)dx=-xdy$

$x^2+40x+400\le0$

$7\left(x^4+x^3-6x^2-4x+8\right)$

$\frac{3\left(x^{2}-4\right)}{9\left(x-4\right)\left(x+2\right)}$