- How to integrate cosπx? must we integrate by parts or what? please help?

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If A, B and C are Hermitian operators, determine if the following combinations are Hermitian:
(a) A + B (b) 1/2i[A,B] (c) (ABC −CBA) ? Comparing the durability of benzene, methane, toluene? A physicist says that a car moving along a level road is being propelled by the road. Defend this statement.? If CD = x − 9, DE = 12, and CE = 2x − 15, what is CD? Find the next term of the following sequence: 3, 1, 4, 5, 21, …?