$\log_{15}\left(1\right)$
$\sec^2\theta\cdot\:\cot^2\theta$
$x^2\frac{dy}{dx}=y^3\left(x+2\right)$
$y-3xy+3y^2+y$
$n^2+3n=10$
$3s^3x\:\:2s\:^{\:3}$
$\frac{1}{1-4x},c=0$
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