$\lim_{x\to4}\left|\frac{3x\sin\left(x+2\right)}{x^2+2x}\right|$

$x-y\left(x-y\right)$

$\int_1^7\left(8\cdot x\cdot e^{x^2}\right)dx$

$\int\left(\left(\frac{-1}{3}\right)\left(2000+x\right)^{-3}\right)dx$

$\frac{3x\left(\frac{x}{2}\right)}{2}+3x\left(x\right)$

$\lim_{x\to\infty}\left(\frac{x^7+2x^3}{x+1}\right)$

$-7\cdot\left[5+\left(-9\right)\right]$