平面向量已知点A、B、C的坐标分别为A(3,0),B(0,3),C(cosα,sinα),α∈(π/2,3π/2)⑴若 |向量AC|=|向量BC|,求α的值.注意是向量BC!(2)若|向量AC|*|向量BC|=-1,求2cos²a+sin2a/(1+1/tana)的值.无理取闹的人
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![平面向量已知点A、B、C的坐标分别为A(3,0),B(0,3),C(cosα,sinα),α∈(π/2,3π/2)⑴若 |向量AC|=|向量BC|,求α的值.注意是向量BC!(2)若|向量AC|*|向量BC|=-1,求2cos²a+sin2a/(1+1/tana)的值.无理取闹的人](/uploads/image/z/12439230-6-0.jpg?t=%E5%B9%B3%E9%9D%A2%E5%90%91%E9%87%8F%E5%B7%B2%E7%9F%A5%E7%82%B9A%E3%80%81B%E3%80%81C%E7%9A%84%E5%9D%90%E6%A0%87%E5%88%86%E5%88%AB%E4%B8%BAA%283%2C0%29%2CB%280%2C3%29%2CC%28cos%CE%B1%2Csin%CE%B1%29%2C%CE%B1%E2%88%88%28%CF%80%2F2%2C3%CF%80%2F2%29%E2%91%B4%E8%8B%A5+%7C%E5%90%91%E9%87%8FAC%7C%3D%7C%E5%90%91%E9%87%8FBC%7C%2C%E6%B1%82%CE%B1%E7%9A%84%E5%80%BC.%E6%B3%A8%E6%84%8F%E6%98%AF%E5%90%91%E9%87%8FBC%21%EF%BC%882%EF%BC%89%E8%8B%A5%7C%E5%90%91%E9%87%8FAC%7C%2A%7C%E5%90%91%E9%87%8FBC%7C%3D-1%2C%E6%B1%822cos%26%23178%3Ba%2Bsin2a%2F%EF%BC%881%2B1%2Ftana%EF%BC%89%E7%9A%84%E5%80%BC.%E6%97%A0%E7%90%86%E5%8F%96%E9%97%B9%E7%9A%84%E4%BA%BA)
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