$\frac{x^4y^4-64a^6}{x^2y^2+8a^3}$

$-16\cdot1<33$

$44x^5y^4-66x^4y^3+55x^3y^2$

$\left(-5\right)x\left(+4\right)x\left(-3\right)x\left(+2\right)$

$1350+\left(-35\right)+28+\left(-112\right)+\left(-78\right)+\left(-200\right)$

$\int6t^3dt$

$\left(4+x\right)\left(\frac{dy}{dx}\right)=3+y$