$xy^3+9x^2y-3xy+4xy^3-2xy-8x^2y$
$3+4x\le5x+4$
$1+\text{sen}\left(2x\right)=2\text{sen}\left(x+45\right)\cdot\cos\left(x-45\right)$
$\cot^2\left(x\right)\cdot\sec^2\left(x\right)-\cot^2\left(x\right)=1$
$x^2\le4$
$x^2-6x-4$
$xln\left(y\right)dx+xdy=0$
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