$x\frac{dy}{dx}=\frac{cos\left(8x\right)}{x}-2y$
$\int ln\left(9x+5\right)dx$
$\frac{\sin5a-\sin3a}{\cos5a+\cos3a}$
$x^2y^4-b^2x^4$
$\lim_{x\to0}\left(\frac{e^x+e^{-x}}{e^x-e^{-x}}-\frac{1}{x}\right)$
$4x^2-3x-1$
$2\sqrt{49}$
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