$\frac{dr}{dx}=rx+r+x+1$
$-\cos\left(x\right)=\cos\left(x\right)^2-2$
$\left(xy-x\right)dx\:=\:\left(x^2y^2-x^2+y^2-1\right)dy$
$9x^2<25$
$24x^2-30x+16$
$\lim_{x\to1}\left(\frac{x^a-ax+a+1}{\left(x-1\right)^2}\right)$
$y'-3y=xe^{2x}+6$
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