$x^3y^6-216y^9$

$\frac{x}{-5}-2=3$

$\int\frac{\sin}{\sqrt{1+2\cos\left(x\right)}}dx$

$\frac{\left(10x^3y^5\right)\left(21x^2y^6\right)}{\left(7xy^3\right)\left(5x^9y\right)}$

$\left(2a^4+3b\right)\left(2a^4-3b\right)$

$3\left(x+4\right)=-18$

$\int\frac{x}{5x^4-5}dx$