$\left(-2x^2y^{-4}\right)^{-2}$

$6x^4-15x^3+21x$

$\left[\left(x^{-2}y^{\frac{1}{4}}\right)-\left(x^{\frac{1}{2}}y^{-3}\right)\right]^3$

$2x^2-4x-10$

$\int6fe^fdf$

$\left(3a^2b+5ab^2\right)^2$

$\lim_{x\to\infty}\left(\frac{2x^3+x^2+9x+1}{3\ln\left(x+9\right)}\right)$