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並前往 https://www.facebook.com/waisir.math/posts/%E5%81%9C%E8%AA%B2%E4%B8%8D%E5%81%9C%E5%AD%B8angle-between-line-and-plane%E5%90%8Ctwo-planes%E9%83%BD%E4%BF%82%E6%AF%94%E8%BC%83%E5%A4%9A%E4%BA%BA%E5%94%94%E8%AD%98%E5%98%85%E4%BD%86%E5%91%A2%E5%80%8B%E5%AE%9A%E7%BE%A9%E5%A5%BD%E5%80%BC%E5%BE%97%E8%A8%98paper-1-section-b%E5%9F%BA/849696025535779/
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