$\frac{dy}{dx}=\frac{2y^2}{1+x^2}$
$\frac{\tan\left(x\right)}{\cot\left(x\right)}-\frac{\cot\left(x\right)}{\tan\left(x\right)}$
$7\cos b+9=3\cos b+8$
$\int7xe^{5x}dx$
$\lim_{x\to0}\left(\frac{4^{\left(3x\right)}-1}{x}\right)$
$y+4=6$
$\frac{ab^4}{b^4}$
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