$\frac{x^{12}-64}{x^4-4}$

$2x+3-8x$

$\lim_{x\to0}\left(\frac{\tan^5\left(2x\right)\cdot\sin\left(4x\right)}{x^6}\right)$

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

$\left(206\right)\left(0.6\right)$

$\frac{\sqrt{\sec^2\left(x\right)-49}}{7\sec\left(x\right)}$

$\lim_{n\to\infty}\left(\frac{\sqrt{n}}{n+1}\right)$