$-x^2+2y^2-2y+x-4=0$
$\frac{k}{-8}=20$
$\frac{dy}{dx}+2xy^4=0$
$\lim_{x\to3}\left(\frac{x^2-7x+12}{x-3}\right)$
$\int\cos^6\left(7x\right)\sin^8\left(7x\right)dx$
$4x+1<13$
$cos\left(x\right)+sin\left(-\frac{24}{25}\right)=1$
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