sin(2A+π/6)=4/5,A∈(π/6,π/2),求cos2A的值.请快点,有好评!
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sin(2A+π/6)=4/5,A∈(π/6,π/2),求cos2A的值.请快点,有好评!
![sin(2A+π/6)=4/5,A∈(π/6,π/2),求cos2A的值.请快点,有好评!](/uploads/image/z/18206726-14-6.jpg?t=sin%EF%BC%882A%2B%CF%80%2F6%EF%BC%89%3D4%2F5%2CA%E2%88%88%EF%BC%88%CF%80%2F6%2C%CF%80%2F2%EF%BC%89%2C%E6%B1%82cos2A%E7%9A%84%E5%80%BC.%E8%AF%B7%E5%BF%AB%E7%82%B9%2C%E6%9C%89%E5%A5%BD%E8%AF%84%21)
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