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My teacher said we aren't allowed to differentiate the sigma in binomial theorem. She said something about it not being mathematically correct to just differentiate a sigma so instead she told us to expand it first and then differentiate. My tutor on the other hand said that its perfectly...

School rank: 120-ish Student 1: Mathematics 4/17 MX1 6/12 Physics 4/11 Biology 1/20 Business Studies 2/10 Adv English 10/24 Student 2: Mathematics 13/17 Economics 1/4 Legal Studies 4/10 Physics 3/11 Adv English 1/22 Ext English 1/9 Student 3: MX1 - 2/12 MX2 - 3/6...