$x^2-2x^2-3x+1=-1si,\:es$
$\left(1+tana\right)cos^2a$
$\frac{100x^6-25y^4}{10x^3+5y^2}$
$35m^5-49^3$
$\frac{13y^8z^3}{4x^5y^5}$
$\left(x^2+2x-3\right)\left(-2x^2-5x-4\right)$
$\sin\left(z\right)\cos\left(z\right)$
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