$x^2+x^3+6yx$
$-72x^2-41x-4$
$-9x^2+x^2+3$
$cscx=-1.392$
$x^2-3x+13$
$\int\sen^{2}bx\cos bxdx$
$\frac{dy}{dx}=3y-\frac{x}{2}$
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