$10\::\:2\:-\:6\::\:3$

$9-\left(-9+3\right)-\left(-4-5\right)$

$\int_{-2}^3e^{-x}dx$

$\cot2a\:=\frac{cot-tag}{2}$

$\frac{n^3+1}{n^2-1}$

$\frac{sen\left(x\right)}{\cos\left(x\right)}-\frac{\cos\left(x\right)}{1+\sin\left(x\right)}=\tan\left(x\right)$

$\left(\frac{3}{4}x^2y-\frac{2}{5}xy^2\right)^3$