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Advanced Physics Homework Help
Finding the amplitude of the sum vector
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[QUOTE="Jolb, post: 4501882, member: 187392"] First of all, this equation really makes no sense:because you are using two different notations for the imaginary unit in the same expression. If you use i to denote the imaginary unit, you should have: Ae[sup]i(wt+∅)[/sup] = A[cos(wt+∅) + i sin(wt+∅)] Second, between the first and second steps in your attempt at a solution, you incorrectly applied that formula. You have changed a real expression into an expression with a real part and a non-zero imaginary part. If you do some simple algebra you should see that you can represent cos(x) as cos(x) = (e[sup]ix[/sup]+e[sup]-ix[/sup])/2 Alternatively, you could write cos(x) as the real part of e[sup]ix[/sup], e.g. cos(x)+cos(y) = Re[e[sup]ix[/sup] + e[sup]iy[/sup]] Try applying those formulae and see if you can make any more progress. And feel free to post again if you get stuck. But you should make a better attempt before I give you any more hints. [/QUOTE]
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Advanced Physics Homework Help
Finding the amplitude of the sum vector
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