已知△ABC的外接圆的半径R=根号3/3 |BC|=1 ∠BAC为锐角 ∠ABC=a 记f(a)=向量AB*向量AC(1)求∠BAC的大小及f(a)的关于a的表达式.(1)求f(a)的值域.
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![已知△ABC的外接圆的半径R=根号3/3 |BC|=1 ∠BAC为锐角 ∠ABC=a 记f(a)=向量AB*向量AC(1)求∠BAC的大小及f(a)的关于a的表达式.(1)求f(a)的值域.](/uploads/image/z/8508525-69-5.jpg?t=%E5%B7%B2%E7%9F%A5%E2%96%B3ABC%E7%9A%84%E5%A4%96%E6%8E%A5%E5%9C%86%E7%9A%84%E5%8D%8A%E5%BE%84R%3D%E6%A0%B9%E5%8F%B73%2F3+%7CBC%7C%3D1+%E2%88%A0BAC%E4%B8%BA%E9%94%90%E8%A7%92+%E2%88%A0ABC%3Da+%E8%AE%B0f%28a%29%3D%E5%90%91%E9%87%8FAB%2A%E5%90%91%E9%87%8FAC%EF%BC%881%EF%BC%89%E6%B1%82%E2%88%A0BAC%E7%9A%84%E5%A4%A7%E5%B0%8F%E5%8F%8Af%28a%29%E7%9A%84%E5%85%B3%E4%BA%8Ea%E7%9A%84%E8%A1%A8%E8%BE%BE%E5%BC%8F.%EF%BC%881%EF%BC%89%E6%B1%82f%28a%29%E7%9A%84%E5%80%BC%E5%9F%9F.)
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