$49a^2+14a+1$
$\frac{du}{dx}-\frac{u}{x}=-\frac{1}{x^2}$
$7^2-14$
$\lim_{x\to0}\left(\frac{2^x-15^x}{x}\right)$
$440+75$
$\int_0^1\left(\frac{1}{\sqrt{25-x^2}}\right)dx$
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