$-6\left(-x^2+3x-1\right)$
$3\sin^2x+2\cos^2x-3$
$9^8$
$4.=20$
$10\left(3\left(\sqrt{7}\right)^2+25\right)$
$9y-30=6$
$-\left(\frac{4}{9}x-\frac{2}{3}-\frac{2}{9}x^2+\frac{1}{3}x^3\right)$
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