$1-\cos2\cdot\csc2$
$k^2\:3k^0$
$\left(a^{-3}\right)^7$
$\left(\frac{x-2x^2}{1}\right)^{10}$
$\frac{dy}{dx}=\frac{1}{\sec\left(2x\right)}$
$\frac{sen7x-senx}{cosx-cos7x}$
$3x-8\le\frac{7}{3}x-5$
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