$\lim_{x\to0}\left(\frac{r^5-x^5}{r^2-x^2}\right)$
$-3y^2+4=2x^2$
$y=y^4$
$625x^4-1$
$\lim_{x\to0}\left(\frac{cos^2\left(3x\right)}{cos^2x}\right)$
$f\left(x\right)=12x^5+9x^3$
$\int_3^5\left(5x+2\right)dx$
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