已知1/2sin(α-π)=cos(α-2π),求sin(π-α)+5cos(2π-α)/3sin(3π/2+α-sin(-α)的值.
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![已知1/2sin(α-π)=cos(α-2π),求sin(π-α)+5cos(2π-α)/3sin(3π/2+α-sin(-α)的值.](/uploads/image/z/4001034-66-4.jpg?t=%E5%B7%B2%E7%9F%A51%2F2sin%28%CE%B1-%CF%80%29%3Dcos%28%CE%B1-2%CF%80%29%2C%E6%B1%82sin%EF%BC%88%CF%80-%CE%B1%EF%BC%89%2B5cos%EF%BC%882%CF%80-%CE%B1%29%2F3sin%EF%BC%883%CF%80%2F2%2B%CE%B1-sin%28-%CE%B1%29%E7%9A%84%E5%80%BC.)
已知1/2sin(α-π)=cos(α-2π),求sin(π-α)+5cos(2π-α)/3sin(3π/2+α-sin(-α)的值.
已知1/2sin(α-π)=cos(α-2π),求sin(π-α)+5cos(2π-α)/3sin(3π/2+α-sin(-α)的值.
已知1/2sin(α-π)=cos(α-2π),求sin(π-α)+5cos(2π-α)/3sin(3π/2+α-sin(-α)的值.
3,将式子中的三角函数都化到最简形式,7上下同除以cosa,由已知条件,tana=-2,代入即可得出答案