$\left(x^2+x^2y^2\right)dx+xdy=0$
$1+3x-1$
$5x\:+\:1\:<\:6$
$3\cdot5+\left(3-2\right)\cdot7+1$
$+4\left(-37\right)$
$\frac{1-\cos\left(4x\right)}{1-\cos\left(2x\right)}$
$3x^2\:entre\:3$
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