$\left(8m-4n\right)^2$

$\int\left(\frac{\left[ln\left(5x\right)\right]^9}{x}\right)\:dx$

$1-3sin\left(x\right)^2$

$-3-\frac{2\left(1-i\right)^7}{\left(1+i\right)^7}$

$10xy+5xz$

$\left(-12+25:\left(-5\right)+23\right)+4.\left(-2\right)$

$\frac{\sin\left(-x\right)\cos x}{\tan x}$