请解下题一楼的那个是最简式了吧,但是貌似不像答案二楼的解(1)(2)怎么得的 "n = 根号【(sinα)平方+(sinβ)平方】"?
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![请解下题一楼的那个是最简式了吧,但是貌似不像答案二楼的解(1)(2)怎么得的 "n = 根号【(sinα)平方+(sinβ)平方】"?](/uploads/image/z/8808329-65-9.jpg?t=%E8%AF%B7%E8%A7%A3%E4%B8%8B%E9%A2%98%E4%B8%80%E6%A5%BC%E7%9A%84%E9%82%A3%E4%B8%AA%E6%98%AF%E6%9C%80%E7%AE%80%E5%BC%8F%E4%BA%86%E5%90%A7%EF%BC%8C%E4%BD%86%E6%98%AF%E8%B2%8C%E4%BC%BC%E4%B8%8D%E5%83%8F%E7%AD%94%E6%A1%88%E4%BA%8C%E6%A5%BC%E7%9A%84%E8%A7%A3%281%29%282%29%E6%80%8E%E4%B9%88%E5%BE%97%E7%9A%84++++++%26quot%3Bn+%3D++%E6%A0%B9%E5%8F%B7%E3%80%90%EF%BC%88sin%CE%B1%EF%BC%89%E5%B9%B3%E6%96%B9%2B%EF%BC%88sin%CE%B2%EF%BC%89%E5%B9%B3%E6%96%B9%E3%80%91%26quot%3B%3F)
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