$\lim_{x\to0}\cos\left(4x\right)-\cos^2\left(2x\right)$
$64 ^ { 3 } x ^ { 6 } - 216 z ^ { 9 }$
$2\cdot\left(\frac{1}{2}a^2-b^2\right)$
$2x+1<3x-1$
$\lim_{x\to0}vf$
$\lim_{x\to0}\left(\frac{\tan\left(a+x\right)-\tan\left(a\right)}{x}\right)$
$16x^2-24x=2$
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