$\lim_{x\to0}\left(\frac{sin\left(4x\right)-4x}{x^2}\right)$
$3,28x+3,48y=1467,8$
$3x^4-192x$
$24a^{3}b+30ac-18a^{3}d$
$4\:sec^2-7\:tan^2x=3$
$2\sin\left(x\right)-1=-\sin\left(x\right)^2-2$
$102,31+3,339$
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