1.在△ABC中,∠C=90°,a=3,∠B=30°,则c和tanA的值分别为( )A.6,√3/3 B.6,√3C.2√3,√3/3D.2√3,√32.在菱形ABCD中,对角线AC=5,BD=12,∠ABD=α,则下列结论正确的是( )A.sinα=12/13B.cosα=5/13C.tanα=12/5D.cotα=12/5
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![1.在△ABC中,∠C=90°,a=3,∠B=30°,则c和tanA的值分别为( )A.6,√3/3 B.6,√3C.2√3,√3/3D.2√3,√32.在菱形ABCD中,对角线AC=5,BD=12,∠ABD=α,则下列结论正确的是( )A.sinα=12/13B.cosα=5/13C.tanα=12/5D.cotα=12/5](/uploads/image/z/14897713-49-3.jpg?t=1.%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2C%E2%88%A0C%3D90%C2%B0%2Ca%3D3%2C%E2%88%A0B%3D30%C2%B0%2C%E5%88%99c%E5%92%8CtanA%E7%9A%84%E5%80%BC%E5%88%86%E5%88%AB%E4%B8%BA%EF%BC%88+%EF%BC%89A.6%2C%E2%88%9A3%2F3+B.6%2C%E2%88%9A3C.2%E2%88%9A3%2C%E2%88%9A3%2F3D.2%E2%88%9A3%2C%E2%88%9A32.%E5%9C%A8%E8%8F%B1%E5%BD%A2ABCD%E4%B8%AD%2C%E5%AF%B9%E8%A7%92%E7%BA%BFAC%3D5%2CBD%3D12%2C%E2%88%A0ABD%3D%CE%B1%2C%E5%88%99%E4%B8%8B%E5%88%97%E7%BB%93%E8%AE%BA%E6%AD%A3%E7%A1%AE%E7%9A%84%E6%98%AF%EF%BC%88+%EF%BC%89A.sin%CE%B1%3D12%2F13B.cos%CE%B1%3D5%2F13C.tan%CE%B1%3D12%2F5D.cot%CE%B1%3D12%2F5)
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