$b4-9$
$\int\frac{2x^6}{5}dx$
$a+a+2a$
$4x+2x^2+6x-3x^2+8x-6x^2+11a^2$
$6+6w$
$\lim_{x\to\infty}\left(\frac{1}{x+3}\right)$
$cos\:2x\:-\:3\:sen\:x\:+\:1\:=\:0$
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