$-\left\{+\left\{6+\left[-\left(7\right)-\left(-12\right)\right]-13\right\}\right\}$
$\frac{sen2x+cos2xsen2x}{sen2xsen2x}$
$a^3+\left(\frac{1}{a}\right)^3$
$2\cdot4,5$
$3^{16}$
$-6+\frac{20}{3}x$
$3x-12x+6x-3x$
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