$\frac{dy}{dx}=e^x-\left(\frac{2x}{x^2-1}\right)$
$x^2>=3x-2$
$5dz+10d$
$\left(-15\right):\left(+3\right)+\left(-3\right)$
$-160\cdot\left(-21\cdot\:1668\right)$
$\sqrt{\frac{5}{3}}\cdot\sqrt{\frac{27}{5}}$
$\sin x^2+\left(1+\cos\left(x\right)\right)^2=2\left(1-\cos\left(x\right)\right)$
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