$1+x^8=a$
$\left(x^3+y^2+z^2\right)^2$
$32x^2+12x-4$
$\int x\frac{1}{5}dx$
$x+\sqrt{x^2}-16$
$\int-4x\cdot\cos\left(7x^2\right)dx$
$3b-2\left(2b+a\right)$
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