$\left(sin\left(x\right)\cdot\:sec\left(x\right)-sin\left(x\right)\right)^2+\left(1-\frac{1}{sec\left(x\right)}\right)^2$

$\lim_{x\to\infty}\left(\frac{e^{2n}}{x^x}\right)$

$3x^73x^{-7}$

$\int\frac{2x}{x^2-49}dx$

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

$6\ln\sqrt[3]{x}$

$\lim_{x\to0}\left(\frac{1-\cos\left(x^2\right)}{x^3\sin\left(x\right)}\right)$