$\lim_{x\to0}\left(\frac{y\left(cos\left(m\right)cos\left(x\right)-sin\left(m\right)sin\left(x\right)\right)-ycos\left(m\right)}{x}\right)$
$6m=-54$
$\lim_{x\to4}\left(25-x^2\right)$
$2\cdot\frac{1}{2}+\frac{1}{2}\cdot2$
$x+2=\sqrt{x+7}$
$2y^{''}-3y^'+4y=0$
$2\left(4\right)+2\left(2\right)$
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