$+1-\left(-8-10\right)+\left(+7-5\right)$
$\lim_{x\to0}\left(\frac{1-\cos0}{2\sin^20}\right)$
$2y^2-2y+1$
$\sin\left(6x\right)+\sin\left(2x\right)=4\sin\left(2x\right)\cos^2\left(2x\right)$
$\left(+7\right)\left(-27\right)\left(+13\right)$
$\frac{dy}{dx}\left(xy+sin\left(x+y\right)=16\right)$
$dx\:-\:dy\:=\:4$
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