一.计算:(1)sin65°=_____;(2)cos36°18’=_____(结果保留四个有效数字)在Rt△ABC中,角C=90°,AC=12,sinB=2/3,那么AB的长等于_____.如图,在Rt△ABC中,∠C=90°,D为AC上的一点,CD=3,AD=BD,BC=4.求∠A的三个三角函
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![一.计算:(1)sin65°=_____;(2)cos36°18’=_____(结果保留四个有效数字)在Rt△ABC中,角C=90°,AC=12,sinB=2/3,那么AB的长等于_____.如图,在Rt△ABC中,∠C=90°,D为AC上的一点,CD=3,AD=BD,BC=4.求∠A的三个三角函](/uploads/image/z/8427000-48-0.jpg?t=%E4%B8%80.%E8%AE%A1%E7%AE%97%EF%BC%9A%EF%BC%881%EF%BC%89sin65%C2%B0%3D_____%3B%282%29cos36%C2%B018%E2%80%99%3D_____%EF%BC%88%E7%BB%93%E6%9E%9C%E4%BF%9D%E7%95%99%E5%9B%9B%E4%B8%AA%E6%9C%89%E6%95%88%E6%95%B0%E5%AD%97%EF%BC%89%E5%9C%A8Rt%E2%96%B3ABC%E4%B8%AD%2C%E8%A7%92C%3D90%C2%B0%2CAC%3D12%2CsinB%3D2%2F3%2C%E9%82%A3%E4%B9%88AB%E7%9A%84%E9%95%BF%E7%AD%89%E4%BA%8E_____.%E5%A6%82%E5%9B%BE%2C%E5%9C%A8Rt%E2%96%B3ABC%E4%B8%AD%2C%E2%88%A0C%3D90%C2%B0%2CD%E4%B8%BAAC%E4%B8%8A%E7%9A%84%E4%B8%80%E7%82%B9%2CCD%3D3%2CAD%3DBD%2CBC%3D4.%E6%B1%82%E2%88%A0A%E7%9A%84%E4%B8%89%E4%B8%AA%E4%B8%89%E8%A7%92%E5%87%BD)
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