$8x-5=5x-32$
$15x^3y^2-20x^5y^2$
$\frac{d^2}{dx^2}\left(\frac{\left(x\right)}{x^2-1}-1\right)$
$\cos\left(50\right)-\cos\:\left(50\right)$
$18m^4n^2+m^8+81m^4n^2$
$2-\sen^{2}x+3\cdot\cos^{2}x=3$
$49a^6-70xa^3y^2+25x^2y^4$
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