$4x^4\left(-2+x^2-3x\right)$
$-8csc^2x-8cotx=-14$
$\frac{x^6-30x-5}{x-2}$
$y^2+x+3=0$
$x+\frac{6}{x}=5$
$4x-2\ge\:2x-4$
$\int\:\frac{sen\left(4x\right)}{cos^2\left(4x\right)}dx$
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