$\left(a-ab+b\right)^2$
$\int\left(2x+1\right)\cdot\left(x^2+x+1\right)dx$
$-4+\sec x=-6$
$\cot^2\left(x\right)+\cot^4\left(a\right)=\csc^4\left(x\right)-\csc^2\left(x\right)$
$\frac{x^{-2}}{1-2.5x^{-1}+2x^{-2}-0.5x^{-3}}$
$\int yb^2\:dy$
$\frac{4x^2z-0,5y^3z}{3}$
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