$-7428\:+-3994$

$81\cdot62$

$\left(9x^3-5\right)\left(9x^3+11\right)$

$\int\:\frac{2}{x^3\sqrt{x^2-4}}dx$

$9+9x+9y$

$\left(4x+1\right)\frac{dy}{dx}=y^3;\:y\left(0\right)=2$

$\left(1-\cos\left(a\right)\right)^2+2\:\cot\left(a\right).\sin\left(a\right)=1+\cos\left(a\right)^2$