$-13^4$
$\frac{dy}{dx}+2y-2x=0$
$\frac{x-3}{-6}\le\frac{9x-27}{3}$
$2\:sinx-\sqrt{2}=0$
$\int\frac{2-x}{x\left(9x^2-12x+4\right)}dx$
$\left(x+1.68\right)\left(0.1\right)$
$\frac{\tan^2x}{\sec^2\left(x\right)}=1-\frac{1}{\sec^2x}$
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