$\sqrt{25y^{10}}$
$\left(2x^3y^2-7x^2y^4\right)\left(7x^3y^2-5x^2y^4\right)$
$\frac{m^{13}}{m^9}$
$9x^2-120-400$
$\frac{4x^3-2x^2+5x+3}{x^2-2}$
$tan\left(a\right)+\frac{1}{sen\left(a\right)}=\frac{1}{sen\left(a\right)\cdot\:\:cos\left(a\right)}$
$\frac{45}{9}-1^2$
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