$\lim_{x\to0}\left(\frac{19x}{19x+7}\right)^{8x}$

$-a^2b-7a^2b$

$\left(\frac{2r^5w^3}{r^4w^3}\right)^4$

$\int sec^2\left(2-12x\right)dx$

$\left(1-\cos x\right)^2+\sin^2x$

$\int_{-\infty}^{-1}\left(\frac{1}{x^{\left(\frac{3}{2}\right)}}\right)dx$

$9 ( g + h + 5 ) ^ { 2 }$