$\left(3x+2y-z\right)+\left(2x+3y+z\right)$
$\int\frac{9x}{x^2+6}dx$
$\left(6v^4-3n^2\right)\cdot\left(6v^4+n^2\right)$
$\sqrt{x^2}-2x$
$\int\frac{\left(x^6+1\right)}{sqrt\left(x^7+7x\right)}dx$
$\int x\cdot\cos\left(3x+3\right)dx$
$\int240cos^2\left(4x-1\right)dx$
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