$4a^2-121$
$\int\frac{lnx+2}{x\sqrt{-9lnx^2+6lnx+3}}dx$
$2\sin\left(x\right)^2-1=\sin\left(x\right)^2-\cos\left(x\right)^2$
$-4=5+y$
$\int\:\frac{1}{\left(1-5t\right)^2}dt$
$\frac{dy}{dx}=\frac{1}{x}+\frac{1}{xy-x}$
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