$\frac{21x^5-21y^5}{3x^2+2y^2}$
$\frac{dy}{dx}+5y=0$
$\lim_{x\to0}\left(1+\sin x-e^x\right)$
$\int_a^b\sqrt[2]{1+b^2}dt$
$3\log_e\left(2e\right)$
$\lim_{x\to7}\left(\frac{5-\sqrt{3x+1}}{x^2-49}\right)$
$3x\left(0\right)$
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