$\lim_{x\to\frac{x}{2}}\left(8cos\left(3x\right)sec\left(5x\right)\right)$
$3\log x-\log x=2$
$6x^2-13x-5=0$
$4x^3+3x^2-x^3-x^2$
$-\frac{9q-1}{q-4}$
$5c-10c^2=0$
$\frac{dy}{dx}\left(\left(1+e^{2x}\right)y\right)=0$
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