$\cos^3x-sen^3x\left(x\right)^2\cdot\cos\left(x\right)^2$
$2x^3-3x^2+4x-6$
$32a^7b^5+48a^6b^4-a^4b^3$
$49x^2-y^2$
$\int\:\frac{2}{5x\left(7x+7\right)}dx$
$5\tan\left(x\right)+3=1$
$\lim_{x\to0}\left(\frac{3x+3sin\left(x\right)}{4x+4cosx}\right)$
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