−x³ + 3x² − 4 is concave upward? On which interval ƒ(x) = −x³ + 3x²

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Q: = 11 2 2 √ S (1 2 stan (n) dn ㄹㅈ = ftan 60 dn 2 Let t= coss √6 +5 (+²= 336 aut = = √3²²+ + ²[1²= 15²…

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