$y^2-9y$
$\sin^2x=0.25$
$\left(10x^2+3xy^3\right)^2$
$5a-8a+a-6a+21a$
$8a^2b-6a^2b-2a^2b$
$4x^2-\frac{64}{2x-8}$
$\int a^3e^ada$
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