$\frac{dy}{dx}+\cot\left(x\right)y=\frac{2}{sin\left(x\right)}$

$\int_0^{\frac{9\sqrt{2}}{2}}\left(\frac{1}{\sqrt{81-x^2}}\right)dx$

$-2x^2+2x+5$

$3\left(16y+9y^3+18y^2\right)+83\left(16y+9y\:3\:+18y\:2\:\right)+8$

$\left(\frac{5}{x-3}\right)-\left(\frac{4}{x+3}\right)$

$\left(8m^2n^4x^5+4a^3\right)\left(8m^2n^4x^5-4a^3\right)$

$\frac{6a}{3a-b}-2$