I'm gonna use sine of theta, oh sorry, sine of phi.
我要使用 theta, 哦抱, 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“4arccot 号下” 并推导来时,你会觉得自己创造一些东西。
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