$2cot\left(x\right)^1-cot\left(x\right)^1=cot\left(z\right)$

$\left(1+\tan\left(a\right)\right)\cdot\left(1+\cot\left(b\right)\right)$

$^{4^5}\cdot\left(4^3\right)^2$

$x2+19x+18$

$\frac{3m^4n^3}{6m^3n^4}$

$-x^3+4x^2+5x$

$\frac{d}{dx}\left(arc\:cot\left(2-3x\right)\right)$