$\tan^2x=3\tan x$
$400x^6-900x^4y^6$
$\lim_{x\to\infty}\left(1-\frac{3}{x+2}\right)^{3.x+4}$
$y^{\prime}-9xy=0$
$x^2+12x+36=\left(x-6\right)^2$
$-1-4.3$
$dydx+2y=1$
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