【填空题】1.已知sin51°12′=0.7793,则cos38°48′=_________.2.在离旗杆20米的地方用测角仪测得旗杆顶的仰角为a,如果测角仪高1.5米,那么旗杆高为___________m.(用含a的三角函数表示)3.正方形ABCD的边
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![【填空题】1.已知sin51°12′=0.7793,则cos38°48′=_________.2.在离旗杆20米的地方用测角仪测得旗杆顶的仰角为a,如果测角仪高1.5米,那么旗杆高为___________m.(用含a的三角函数表示)3.正方形ABCD的边](/uploads/image/z/5468516-44-6.jpg?t=%E3%80%90%E5%A1%AB%E7%A9%BA%E9%A2%98%E3%80%911.%E5%B7%B2%E7%9F%A5sin51%C2%B012%E2%80%B2%3D0.7793%2C%E5%88%99cos38%C2%B048%E2%80%B2%3D_________.2.%E5%9C%A8%E7%A6%BB%E6%97%97%E6%9D%8620%E7%B1%B3%E7%9A%84%E5%9C%B0%E6%96%B9%E7%94%A8%E6%B5%8B%E8%A7%92%E4%BB%AA%E6%B5%8B%E5%BE%97%E6%97%97%E6%9D%86%E9%A1%B6%E7%9A%84%E4%BB%B0%E8%A7%92%E4%B8%BAa%2C%E5%A6%82%E6%9E%9C%E6%B5%8B%E8%A7%92%E4%BB%AA%E9%AB%981.5%E7%B1%B3%2C%E9%82%A3%E4%B9%88%E6%97%97%E6%9D%86%E9%AB%98%E4%B8%BA___________m.%EF%BC%88%E7%94%A8%E5%90%ABa%E7%9A%84%E4%B8%89%E8%A7%92%E5%87%BD%E6%95%B0%E8%A1%A8%E7%A4%BA%EF%BC%893.%E6%AD%A3%E6%96%B9%E5%BD%A2ABCD%E7%9A%84%E8%BE%B9)
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