$\frac{\left(-a+2\right)}{-a^2-a+6}$
$-\left\{3x+2a+\left(x-a\right)-\left(2x+a\right)\right\}$
$\int\frac{\sen3x}{1+\cos3x}dx$
$-5+x<17$
$\left(\frac{9}{16}x+\frac{4}{8}3\right)^2$
$\int\tan\left(5x+3\right)\:dx$
$\sqrt{2}+4\sqrt{2}$
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