\(h =30sin{\alpha} =18sin{2\alpha} = 36sin{\alpha}cos{\alpha}\);
\(cos{\alpha} = 5/6\),\(\alpha = cos^{-1}(5/6)\)
\(cos{\alpha} = 5/6\),\(\alpha = cos^{-1}(5/6)\)
���༭ʱ��: 2021-06-23 01:36:08
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