$\int13sin\left(x\right)\cos\left(x\right)dx$
$8\cdot66$
$\frac{d}{dx}x^2\:y^2+y+x=2$
$\int\frac{4x}{x^4-1}dx$
$3\left(\cos\left(3x\right)-\cos\left(x\right)\right)=0$
$\frac{\left(3x+\left|x\right|\right)}{x}$
$4a^3+3a^3-b^2-3a^3$
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