$6xy^2\left(3y-x\right)-3x^2\left(x-3y\right)^2$

$\frac{dy}{dx}=8-\frac{3y}{90+x}$

$\left(-2\right)\cdot\left(-4\right)\cdot5\cdot\left(-4\right)\cdot5\cdot6$

$\int x^2\cdot e^{1-3x}dx$

$2\left(a-c\right)+3\left(c-e\right);a=2;c=3;e=5$

$\frac{4x^3\:-\:4x^2\:+x-1}{2x^2+x-1}$

$\frac { 3 } { 3 } i ^ { 2 }$