$\int_{\frac{\pi}{12}}^{\frac{\pi}{6}}\left(\csc^4\left(3x\right)\cot\left(3x\right)\right)dx$
$\frac{7}{a}-\frac{3}{a}$
$\left(\sqrt{\frac{4x^2}{2^4}}\right)\left(\sqrt{\frac{9x^4}{3^6}}\right)$
$\left(9w+7x\right)^2$
$12 \cdot 3 + 18 : ( - 2 + 8 )$
$x-2y=0$
$\cos^2x+2\cos x+1$
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