$\lim_{x\to0}\left(\frac{x^2}{sin^2\left(t\right)}\right)$

$\frac{9}{13}\cdot\:\frac{17}{24}\cdot\:\frac{z}{3}\cdot\:\frac{4z}{5}\cdot\:\frac{6}{7}$

$x^3-3x^2-2x+2$

$\left(5h+10k\right)^2$

$\lim_{x\to1}\left(1-\frac{1}{x-1}\right)$

$9^8$

$\frac{dy}{dx}=e^{2x}\cos^2\left(y\right)$