$ex x^{-x^2}$
$3\left(\tan\left(45\right)^2\right)+\cot2\left(45\right)-3=0$
$\frac{dy}{dx}=0.3-y$
$\left(9.9\right)\cdot\left(-30.6\right)$
$\lim_{x\to0}\left|\frac{3x}{\sin2x}\right|$
$4x^2+5x^3$
$2+3\cdot\left(-4+2\cdot7\right)-\left(-9+8-6\right)$
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