$16+625x^2+300x+350x+180$
$x\left(x+5\right)$
$\int_{-1}^1\frac{3x^2-2x-6}{\left(x-4\right)\left(x^2+1\right)}dx$
$lny=ln\left(x^{tanx}\right)$
$9y\:+\:3\:-\:4x\:-\:2y\:-\:3x\:-\:5$
$\frac{x^{3}+1}{x^{2}-x-2}$
$\frac{\sin a}{\tan2a}=\cos a-\frac{\sin^2a}{\cos a}$
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