$9a^2-4b^2\:3a+2b$
$5^3+y^3$
$\frac{2x\left(1-\left(4\right)+1\right)-2x}{x^{2}+y^{2}\sqrt{y^{2}+1}}$
$\int sen\left(\frac{7x}{4}\right)dx$
$4x-8;\:x=-20$
$\sqrt{180}$
$\frac{d}{dx}\left(x^8y^7-y=x\right)$
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