ABC所对边为a,b,c,设f(x)=cosxcos(x-A)-1/2cosA.一:求函数的最小正周期和最大值.二:若函数在x=π/3处取得最大值,求a(cosB+cosC)/(b+c)sinA
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![ABC所对边为a,b,c,设f(x)=cosxcos(x-A)-1/2cosA.一:求函数的最小正周期和最大值.二:若函数在x=π/3处取得最大值,求a(cosB+cosC)/(b+c)sinA](/uploads/image/z/3017831-23-1.jpg?t=ABC%E6%89%80%E5%AF%B9%E8%BE%B9%E4%B8%BAa%2Cb%2Cc%2C%E8%AE%BEf%28x%29%3Dcosxcos%28x-A%29-1%2F2cosA.%E4%B8%80%EF%BC%9A%E6%B1%82%E5%87%BD%E6%95%B0%E7%9A%84%E6%9C%80%E5%B0%8F%E6%AD%A3%E5%91%A8%E6%9C%9F%E5%92%8C%E6%9C%80%E5%A4%A7%E5%80%BC.%E4%BA%8C%EF%BC%9A%E8%8B%A5%E5%87%BD%E6%95%B0%E5%9C%A8x%3D%CF%80%2F3%E5%A4%84%E5%8F%96%E5%BE%97%E6%9C%80%E5%A4%A7%E5%80%BC%2C%E6%B1%82a%28cosB%2BcosC%29%2F%28b%2Bc%29sinA)
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