$2x-5y\sqrt{x^2+1}\frac{dy}{dx}=0$

$x-2=\frac{x^2}{2x+3}$

$\left(x^{-2}+y^{-3}\right)\left(x^{-3}-y^{-3}\right)$

$u^2+-u+-7u-7u+3$

$\sqrt[4]{1+3\left(2^2+1\right)}\left(2^4+1\right)$

$3,58-0,6$

$\frac{9t^2}{25}-\frac{25s^4}{9}$