$u^3.u.u^3$
$\lim_{x\to2}\left(\frac{x^3-8}{x^2-3x+2}\right)$
$\lim\:_{x\to\:4}\left(\frac{3\sqrt{5+x}}{2-\sqrt{8-x}}\right)$
$3.454\cdot1.32$
$\lim_{x\to0}\left(\frac{6x-e^x-e^{7x}}{1-cos\left(x\right)}\right)$
$\frac{\sec\left(x\right)}{1-\cos^2\left(x\right)}=\cos\left(x\right)$
$12-7^3$
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