(1/2)已知向量m=(sinA,cosA),向量n=(根号3,-1),且两向量乘积等于1,A为锐角,(1)求角A的大小 (2)求...(1/2)已知向量m=(sinA,cosA),向量n=(根号3,-1),且两向量乘积等于1,A为锐角,(1)求角A的大小 (2)求函数f(x
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![(1/2)已知向量m=(sinA,cosA),向量n=(根号3,-1),且两向量乘积等于1,A为锐角,(1)求角A的大小 (2)求...(1/2)已知向量m=(sinA,cosA),向量n=(根号3,-1),且两向量乘积等于1,A为锐角,(1)求角A的大小 (2)求函数f(x](/uploads/image/z/2522896-16-6.jpg?t=%281%2F2%29%E5%B7%B2%E7%9F%A5%E5%90%91%E9%87%8Fm%3D%28sinA%2CcosA%29%2C%E5%90%91%E9%87%8Fn%3D%28%E6%A0%B9%E5%8F%B73%2C-1%29%2C%E4%B8%94%E4%B8%A4%E5%90%91%E9%87%8F%E4%B9%98%E7%A7%AF%E7%AD%89%E4%BA%8E1%2CA%E4%B8%BA%E9%94%90%E8%A7%92%2C%281%29%E6%B1%82%E8%A7%92A%E7%9A%84%E5%A4%A7%E5%B0%8F+%282%29%E6%B1%82...%281%2F2%29%E5%B7%B2%E7%9F%A5%E5%90%91%E9%87%8Fm%3D%28sinA%2CcosA%29%2C%E5%90%91%E9%87%8Fn%3D%28%E6%A0%B9%E5%8F%B73%2C-1%29%2C%E4%B8%94%E4%B8%A4%E5%90%91%E9%87%8F%E4%B9%98%E7%A7%AF%E7%AD%89%E4%BA%8E1%2CA%E4%B8%BA%E9%94%90%E8%A7%92%2C%281%29%E6%B1%82%E8%A7%92A%E7%9A%84%E5%A4%A7%E5%B0%8F+%282%29%E6%B1%82%E5%87%BD%E6%95%B0f%28x)
(1/2)已知向量m=(sinA,cosA),向量n=(根号3,-1),且两向量乘积等于1,A为锐角,(1)求角A的大小 (2)求...(1/2)已知向量m=(sinA,cosA),向量n=(根号3,-1),且两向量乘积等于1,A为锐角,(1)求角A的大小 (2)求函数f(x
(1/2)已知向量m=(sinA,cosA),向量n=(根号3,-1),且两向量乘积等于1,A为锐角,(1)求角A的大小 (2)求...
(1/2)已知向量m=(sinA,cosA),向量n=(根号3,-1),且两向量乘积等于1,A为锐角,(1)求角A的大小 (2)求函数f(x
(1/2)已知向量m=(sinA,cosA),向量n=(根号3,-1),且两向量乘积等于1,A为锐角,(1)求角A的大小 (2)求...(1/2)已知向量m=(sinA,cosA),向量n=(根号3,-1),且两向量乘积等于1,A为锐角,(1)求角A的大小 (2)求函数f(x
显示只有一问:√3sinA-cosA=1 ;变形为(√3/2)*sinA-(1/2)cosA=1/2 sin(A-30°)=1/2
A-30°=30° A=60°
①A*B=√3sinA-cosA=2sin﹙A﹣π/6﹚=1,
sin﹙A﹣π/6﹚=½,A取锐角,-π/6<A-π/6<π/3,A-π/6=π/6,
A=π/3