一道函数一道向量.已知cosa[1+tan(-a)]=1/2.则sina*cosa=?(a是aerfa,)已知向量AB与AC夹角为135度,AC=(1,-1),则向量AC在BA上的射影为?抱歉我没钱了.-.-
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![一道函数一道向量.已知cosa[1+tan(-a)]=1/2.则sina*cosa=?(a是aerfa,)已知向量AB与AC夹角为135度,AC=(1,-1),则向量AC在BA上的射影为?抱歉我没钱了.-.-](/uploads/image/z/12554379-27-9.jpg?t=%E4%B8%80%E9%81%93%E5%87%BD%E6%95%B0%E4%B8%80%E9%81%93%E5%90%91%E9%87%8F.%E5%B7%B2%E7%9F%A5cosa%5B1%2Btan%28-a%29%5D%3D1%2F2.%E5%88%99sina%2Acosa%3D%3F%EF%BC%88a%E6%98%AFaerfa%2C%EF%BC%89%E5%B7%B2%E7%9F%A5%E5%90%91%E9%87%8FAB%E4%B8%8EAC%E5%A4%B9%E8%A7%92%E4%B8%BA135%E5%BA%A6%2CAC%3D%281%2C-1%29%2C%E5%88%99%E5%90%91%E9%87%8FAC%E5%9C%A8BA%E4%B8%8A%E7%9A%84%E5%B0%84%E5%BD%B1%E4%B8%BA%3F%E6%8A%B1%E6%AD%89%E6%88%91%E6%B2%A1%E9%92%B1%E4%BA%86.-.-)
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