$7x<40$
$\int\left(sen5x-senx\right)^2dx$
$5x^4-20x^2$
$\sqrt[2]{50}$
$\frac{3^2}{9}$
$3t^2+6\sqrt[2]{3}+9$
$2x+1\:+\:2x-1\:are$
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