$\lim_{x\to\frac{\pi}{2}}\left(\frac{7-\sin\left(x\right)}{2+2\cos\left(x\right)}\right)$
$\left(r-3\right)\left(r-4\right)$
$16x^2+32x+384$
$\frac{dy}{dx}=\frac{4-y}{\left(x-1\right)^{-2}}$
$169x^2y^4-8xy^2=0$
$8x-3y+2+x-y$
$y'=-4y+3\cdot\:\:e^{-t}$
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