$\int7\left(9-18y+9y^2\right)dy$
$\sqrt { 121 }$
$6x^2-9x+15$
$0.7\cdot0.9$
$\frac{3}{\pi}x^2-\frac{2}{\pi}x$
$12sen^3x\:+\:12\:cosx\:sen^3x\:+\:20\:tan^2\:sen^2x$
$\frac{dy}{dx}=-8x$
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