I'm gonna use sine of theta, oh sorry, sine of phi.
我要使用正弦 theta, 哦抱歉,正弦 phi。
When you come up with something that's 4 pi arccotangent square root of phi, and you've derived it, you do feel like you created something.
当你想出了“4arccot 根号下” 并推导出来时,你会己创造了一些东西。
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