$36f^4-64$

$3x\left(x^2+3\right)$

$\left(x-4\right)\left(x+5\right)\left(x+4\right)\left(x-5\right)$

$\left(y\cos\left(x\right)+2xe^y\right)dx+\left(\sin\left(x\right)+x^2e^y+2y-3\right)dy=0$

$\int e^3\ln\left(2x-19\right)dx$

$\left|-2\:\:\:\:\:1\right|\:\cdot\left|5\:\:2\:\:\right|\:\cdot\:21$

$64y^6-x^3$