导数应用题在半径为0.5米的圆桌中心上方安装一吊灯,桌面上灯光的强度是y=k*sina/r2( r的平方分之sina),其中r是灯与桌面上被照点的距离,a是光线与桌面的夹角,为了使桌面上的灯光最亮,吊灯应
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![导数应用题在半径为0.5米的圆桌中心上方安装一吊灯,桌面上灯光的强度是y=k*sina/r2( r的平方分之sina),其中r是灯与桌面上被照点的距离,a是光线与桌面的夹角,为了使桌面上的灯光最亮,吊灯应](/uploads/image/z/8612241-33-1.jpg?t=%E5%AF%BC%E6%95%B0%E5%BA%94%E7%94%A8%E9%A2%98%E5%9C%A8%E5%8D%8A%E5%BE%84%E4%B8%BA0.5%E7%B1%B3%E7%9A%84%E5%9C%86%E6%A1%8C%E4%B8%AD%E5%BF%83%E4%B8%8A%E6%96%B9%E5%AE%89%E8%A3%85%E4%B8%80%E5%90%8A%E7%81%AF%2C%E6%A1%8C%E9%9D%A2%E4%B8%8A%E7%81%AF%E5%85%89%E7%9A%84%E5%BC%BA%E5%BA%A6%E6%98%AFy%3Dk%2Asina%2Fr2%28+r%E7%9A%84%E5%B9%B3%E6%96%B9%E5%88%86%E4%B9%8Bsina%29%2C%E5%85%B6%E4%B8%ADr%E6%98%AF%E7%81%AF%E4%B8%8E%E6%A1%8C%E9%9D%A2%E4%B8%8A%E8%A2%AB%E7%85%A7%E7%82%B9%E7%9A%84%E8%B7%9D%E7%A6%BB%2Ca%E6%98%AF%E5%85%89%E7%BA%BF%E4%B8%8E%E6%A1%8C%E9%9D%A2%E7%9A%84%E5%A4%B9%E8%A7%92%2C%E4%B8%BA%E4%BA%86%E4%BD%BF%E6%A1%8C%E9%9D%A2%E4%B8%8A%E7%9A%84%E7%81%AF%E5%85%89%E6%9C%80%E4%BA%AE%2C%E5%90%8A%E7%81%AF%E5%BA%94)
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