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xpoega4-3xpotega2+2xpotega3-6x-4>0
b)2xpptega4-3xpotega3+xpotega2+2xpotega3-3xpotega2+x-4xpotega2+6x-2>0
2xpotega4-xpotega3-6xpotega2+7x-2>0