$\int_0^9\left(7w-x^2\right)^2-2x^2dx$
$\frac{1-cos^2x}{-sinx}=-sinx$
$( 4 a + 2 b )$
$3w+2\le20$
$-1432+-1532$
$\frac{d}{dx}x^2-y^2=xy$
$\left(9m^3-2n\right)^2$
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