$\cos\left(3x\right)=\frac{-\sqrt{2}}{2}$
$l\log_x\left(64\right)=3$
$y'+2y=e^{-2x}$
$\frac{x+3}{6}<\frac{2x+1}{2}$
$-\:\frac{3a}{a^4}$
$y^2\:+\:7y\:=\:7$
$\lim_{x\to0}\left(\frac{3\sin\left(5x^3\right)}{2x^2}\right)$
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