$6\cdot\left(-1-x\right)\ge-4+5\cdot x$
$\frac{dy}{dx}=3x^2\left(5x^{-4}+2\right)$
$4x^2-3\:si\:x=3$
$\int\frac{3x+1}{x^2+2x-15}dx$
$\int x\left(3x+8\right)dx$
$\cos^2x+4\cos x=0$
$-18x+9-23x$
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