$0-\left(-1\right)\cdot\left(-10\right)$
$\int\frac{a^2}{\sqrt{4-a^2}}dx$
$-a^2-10a+25$
$\left(4.2\right)^2$
$3x^2y-2xy+3y\cdot xy+2y$
$\left(4x^3+8x^2-3x+5\right).\left(5x^2-8\right)$
$4+x^4+4x^2$
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