$\int sen^4\left(3x\right)dx$
$\left(2c-7f\right)\left(2c+7f\right)$
$\cot\left(a\right)+\frac{2}{\sec\left(x\right)}=0$
$\frac{x^3-4x^2+3x-2}{x-2}$
$25x^{14}-49y^6$
$\sqrt[18]{1}$
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