$2a-3b+c+2a+a-2b-c$
$\frac{d}{dx}\left(x^2y-x-3y-9=0\right)$
$( 6 x ^ { 2 } - m ^ { 2 } x ) ^ { 2 }$
$\left(4x^5+9y^6\right)^2$
$\cos^2x\cdot\cos x^2-\sin^2x\cdot\sin^2x=\cos2x$
$11\int sin\left(x\right)\cos\left(x\right)dx$
$4x^2+3x^3+x$
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