$\left(9x^2-9+1\right)-\left(12x^2-x-6\right)$
$\sqrt{-56}$
$\frac{3}{435.3}$
$\left(4x^3+5x^2-6x+1\right)+\left(-7x^3-x^2+9\right)$
$\frac{4x^5-3x^2+x-+1}{2x^3}$
$\int\frac{8x}{\left(2+4x^2\right)^2}dx$
$\int f^2\cos f\cdot df$
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