$\lim_{x\to0}\left(\frac{cos4x}{xtan2x}\right)$
$\lim_{x\to8}\sqrt{\frac{7x+7}{3x-3}}$
$\left(x^2+4\right)\cdot y'\left(x\right)=x\cdot y\left(x\right)$
$25r^2-49$
$2x-40>50x+16$
$2y+y$
$-\:4;\:y=\:2\:$
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