$12x^6-56x^5+32x^4$
$\frac{x^2+14x+49}{x+7}$
$\:y=\frac{1}{4}sen2x+2\left(senx\right)$
$2yx^3\left(xy^{-4}\right)$
$1.3a+2.4a$
$\frac{\sin\left(x\right)^2}{\sec\left(x\right)^2}$
$6x^2+8a^2-8$
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