$\lim_{x\to4}\left(\frac{x^3-64}{x^2+4x+16}\right)$

$\left(\cot\left(x\right)-1\right)\left(\sin\left(x\right)+1\right)=0$

$\left(2x^3y^5-7\right)\left(2x^3y^5+3\right)$

$3\left(x-4\right)\le2\left(x+7\right)$

$\left(2\right)\left(+2\right)\left(-1\right)\:-\:-2$

$\left|1\cdot\left(-53\right)\right|-43$

$2x^4\left(x^2-6x\right)$