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

$\frac{8a^{3}bc^{-1}}{12ab^{4}c^{2}}$

$x^2+-\frac{3}{5}+\frac{9}{100x^2}$

$2\left(2\right)+3\left(-1\right)+4\left(3\right)$

$\sqrt{x}e^{x^5}\left(x^2+1\right)^5$

$\left(p+2\right)\left(p-2\right)$

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