$\int x\cot^2\left(x^2\right)dx$
$\left(x^2y-2+2x^2-y\right)dx-\left(xy^2-4-4x-y^2\right)dy=0$
$x^2-3x^3+8x^4$
$x^6+2x^5+3x^4+6x^3$
$\int_0^1\left(1-t^2\right)^{-\frac{1}{2}}dx$
$\left(\frac{1}{2}\:x^{n+1}-\frac{1}{2}\:y^n\right)^4$
$12a^2-3a-21a^3$
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