$\frac{dy}{dx}\left(\frac{x^2+3}{x+4}\right)$
$\left(a+b\right)^2-\left(a-b\right)^2=20$
$x-7<-1$
$-8,56-1,37$
$4a^2b^2-9x^2y^4$
$\int x\left(3-2x-x^4\right)dx$
$7-6\cos^2\left(x\right)=5\sin\left(x\right)$
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