$-21\cdot\left(-13\right)$
$1+cos2x+2sin^2x=2$
$\lim_{x\to0}\left(\frac{\tan\left(3x\right)^2}{2x}\right)$
$2ydy=xdx$
$\left(x^3\:-\:27\right):\left(x\:-\:3\right)\:$
$2x-7y+2=0$
$4^2\cdot4^3\cdot4$
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