$\lim_{x\to3}\left(\frac{1-cos\left(5x\right)}{25x^2}\right)$
$-1^{20}$
$20xy+2x$
$3+0748$
$\left(+4-19\right)-13$
$xy\frac{dy}{dx}=1-x^2$
$2x^2+12x+11$
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