$\int\cot^{-1}\left(2y\right)dy$

$-\left\{9-\left[4\left(-1-1\right)-8\left(5-9\right)-5\left(1-6\right)\right]-14\right\}$

$4m^3\sqrt{12bc^2}$

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

$\frac{3x^3+3x^2-21x+4}{x-2}$

$3x+4y=21$

$\frac{x^3+2x+x+18}{x}$