$tan^2x+4tanx-5=0$
$\frac{2x^2-8}{3x-2\sqrt{1-4x}}$
$2xy^'+4y=10x^3$
$n+19=40$
$f\left(x\right)=\left(2x+2\right)\left(x^2-2\right)^2$
$\sqrt{75qr^3}$
$\frac{dy}{dx}=\frac{-30t}{t^2+5}$
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