$cos4\theta\:=8sen^4\theta\:-8sen^2\theta\:+1$
$-7=1+\frac{x}{3}$
$15x\:\:\:\:=-30$
$\cos\left(1\right)=\sin\left(1\right)$
$6x-2<8+x$
$\lim_{x\to0}\left(\frac{x^7lnx}{7}\right)$
$2-3\left(5+2\right)\left(5-8\right)$
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