$\cot a\left(\cos\right)$

$5+\left|3-\left(12+4-1\right)+16\right|-11-\left(2+7\right)$

$\sqrt[3]{2197}$

$\sec\left(x\right)\left(\cot^2\left(x\right)\right)\:=\:\frac{\cos\left(x\right)}{\sin^2\left(x\right)}$

$\left(3ab^2c^3+\frac{1}{2}bc^2\right)\left(\frac{1}{2}bc^2-3ab^2c^3\right)$

$\left(-9y^2+6y-1\right)+3$

$5x^2\left(2x^3-3x^2+4x-5\right)$