1、已知三点A(cosα,sinα),B(cosβ,sinβ),C(cosγ,sinγ),若向量OA+kOB+(2-k)OC=0向量(k为常数且0<k<2,O为坐标原点,S△BOC表示△BOC的面积)(1)求cos(β-γ)的最值及相应的k的值;(2)求cos
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![1、已知三点A(cosα,sinα),B(cosβ,sinβ),C(cosγ,sinγ),若向量OA+kOB+(2-k)OC=0向量(k为常数且0<k<2,O为坐标原点,S△BOC表示△BOC的面积)(1)求cos(β-γ)的最值及相应的k的值;(2)求cos](/uploads/image/z/10372775-23-5.jpg?t=1%E3%80%81%E5%B7%B2%E7%9F%A5%E4%B8%89%E7%82%B9A%EF%BC%88cos%CE%B1%2Csin%CE%B1%EF%BC%89%2CB%EF%BC%88cos%CE%B2%2Csin%CE%B2%EF%BC%89%2CC%EF%BC%88cos%CE%B3%2Csin%CE%B3%EF%BC%89%2C%E8%8B%A5%E5%90%91%E9%87%8FOA%2BkOB%2B%EF%BC%882-k%EF%BC%89OC%3D0%E5%90%91%E9%87%8F%EF%BC%88k%E4%B8%BA%E5%B8%B8%E6%95%B0%E4%B8%940%EF%BC%9Ck%EF%BC%9C2%2CO%E4%B8%BA%E5%9D%90%E6%A0%87%E5%8E%9F%E7%82%B9%2CS%E2%96%B3BOC%E8%A1%A8%E7%A4%BA%E2%96%B3BOC%E7%9A%84%E9%9D%A2%E7%A7%AF%EF%BC%89%EF%BC%881%EF%BC%89%E6%B1%82cos%EF%BC%88%CE%B2-%CE%B3%EF%BC%89%E7%9A%84%E6%9C%80%E5%80%BC%E5%8F%8A%E7%9B%B8%E5%BA%94%E7%9A%84k%E7%9A%84%E5%80%BC%EF%BC%9B%EF%BC%882%EF%BC%89%E6%B1%82cos)
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