We know that Bí = Rik Bu Bk What about J; how does that transform under rotations? I will show that - transforms as a vector", i.e., in the same way as B does; Di = Rij Vj. 'cosø -sinf For simplicity, consider 2D: = 2 ox ) ; X = RX, with R = want to We want = to find: ax' ه ای را به ایمی sing cosø Use the chain rule, eg: af = ax' of ax ах дух af ду ag ax' ก 器 22 را = R11 af ду + R12 0774
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Explain in detail why the line circled in red is true
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