$\lim_{x\to\infty}\left(6x^2\cdot e^{\frac{-3}{x^2}}-6x^2\right)$

$\frac{\left(\sin\left(x\right)\right)^2}{\left(\cos\left(x\right)\right)^3}$

$18^{-6}\cdot18^8$

$\int\left(\frac{7}{x^6}\right)dx$

$\left(2x+3\right)\left(2x+9\right)$

$\left(u^{\frac{1}{3}}-1\right)^2$

$\left(\:y^4\:-\:2\right)^3$