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Hi ctlawson, as part of our job in this question we need to break the electric fields into 'x' and 'y' components. It would be perfectly OK to use $60^\circ$. The difference is that you would have to think about which trig. function is the right one to use. For example, when I calculate $E_{Bx}$ using $\cos(30^\circ)$ you could instead use $\sin(60^\circ)$. It's just a matter of personal preference.