$3x^2+18x-12=0$
$\frac{1+\:sen2a\:-\:cos2a}{1+\:sen2a\:+\:cos2a}$
$\left(x+10\right)\left(x+4\right)\left(x+4\right)$
$\int\frac{2}{x^2\sqrt{\left(x^2-1\right)}}dx$
$1-tan^3x$
$\left(+3\right)-\left(-2\right)+\left(+4\right)-\left(-3\right)$
$30x+40=130x-160$
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