$\int\frac{\sin\left(18x\right)}{1+\cos^2\left(18x\right)}dx$
$\frac{dy}{dx}=\frac{1}{sin\left(x+y\right)}-1$
$\frac{d}{dx}\left(xy^2+3x^2=4y\right)$
$\frac{dy}{dx}-y\sec\left(x\right)=0$
$x+2y-42=-4$
$2x^2-12x+29$
$3x+6\le27$
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