$14x^2\:-\:21x^3+49x^4$
$\left(4t^3+5u^2\right)^2$
$\left(-45\right)-\left(-65\right)-\left(-54\right)+\left(+56\right)$
$\left(5x-y\right)\left(5x+y\right)\left(25x^2+y^2\right)$
$\int\:\frac{sen\:2\:x\:}{3\:+\:cos2x}.dx$
$-4y^2-16y$
$-\frac{5}{3}a^2b-\frac{7}{2}ab^2+\frac{1}{4}a^2b+5ab^2-6a^2b-\frac{1}{3}ab^2$
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