$\frac{d}{dy}4x^3y-y^2$
$\left(4x+2y+y\right)^2$
$169m^2+26m+1$
$z^4-10z^2+9$
$\lim_{n\to+\infty}\left(\frac{cos^2\left(n\right)}{2^n}\right)$
$\left(\frac{4}{5}x+\frac{3}{9}x\right)$
$\frac{3y^2+13y-32}{y+6}$
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