$\left(4xy^3\right)\left(6x^4y^2\right)$
$4x\cdot27x^3$
$2z\left(2z-k\right)^2$
$\left(8x^2+7\right)\left(8x^2-7\right)$
$\sin\left(x\right)\cos\left(x\right)\cos2\left(x\right)=-\frac{1}{2}$
$\frac{2tan\left(16x\right)}{1-tan^2\left(16x\right)}$
$\lim_{x\to\infty}\left(\frac{sin\left(\frac{1}{x}\right)}{x}\right)$
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