$\lim_{x\to0}\left(\frac{1-x+lnx}{1+cos3\pi x}\right)$
$\frac{dy}{dx}=ky\left(10-y\right)$
$r+6-s+9$
$\left(2t-1\right)^2$
$\frac{dy}{dx}=\frac{y}{x}\:+\:\frac{x^2}{y^2}+1$
$\log\left(x+3\right)^2+\log40=3$
$\int\frac{-1}{\left(4u+3\right)^3}du$
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