$4x^2+3y^2+5x^2+x^2-y^2$
$2^{18}$
$\int\frac{1}{9-3x}dx$
$x^2y-2xy+1-3x^2y+\frac{1}{2}$
$\frac{cos\left(x\right)+1}{sec^2\left(x\right)-1}=\frac{cos\left(x\right)}{sec\left(x\right)-1}$
$\int x\left(x^2-8x+12\right)dx$
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