$limx->0+\left(tan^x\left(1-x^x\right)\right)$
$\lim_{n\to\infty}\left(cos\:\left(\frac{n.\pi\:}{2}\right)\right)$
$\cos\left(2x\right)-\frac{1}{2}\cos\left(x\right)+\sin\left(x\right)^2=0$
$\left(2x-4\right)\left(2x+2\right)$
$x^2-6x-720$
$\lim_{x\to0}\left(\frac{1-\cos\left(4x\right)}{8x^2}\right)$
$\left(12m+4\right)^2$
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