$1.\left(2a+b\:\right)^2$
$\int\int_0^{\pi}\frac{4}{x^2+1}dx$
$\int\frac{x^4-9}{9+x^2}dx$
$x^2-9x+20\frac{1}{4}$
$\int_{-\frac{1}{2}}^0\left(\frac{1}{\sqrt{1-x^2}}\right)dx$
$x^3y^2+xy^3+2x^2y^3$
$36x^2-72x+81$
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