$\int\sqrt{7}x^{-4}dx$
$2x^2-7x=0$
$c-2=\frac{18}{c}+7$
$8x-6y\sqrt{x^2+1}\frac{dy}{dx}=0$
$x^3y-y^3$
$\cos^2\left(5\right)-\sin^2\left(5\right)=\cos\left(2\right)\left(5\right)$
$\frac{3+x}{3-x}\ge\:\:1$
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