$18\cdot4+18-\left(-2\right)+11$

$\frac{12x^3+24x^2+21x+11}{3x+3}$

$\sec^2\left(a\right)\csc^2\left(a\right)=\sec^2\left(a\right)+\csc^2\left(a\right)$

$2x\left(x-3\right)\left(x+2\right)+2\left(x+2\right)\left(x+1\right)$

$2y'+y=3t^2$

$m^2-12m+18=0$

$\frac{d}{dx}\left(\sqrt{x+\sqrt{1-2x}}\right)$