已知sin α是方程5x²-7x-6=0的根,求〔sin(α+3/2π)sin(3/2π-α)*tan²(2π-α)〕/〔cos(π/2-α)cos(π/2 +α)〕的值
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已知sinα是方程5x²-7x-6=0的根,求〔sin(α+3/2π)sin(3/2π-α)*tan²(2π-α)〕/〔cos(π/2-α)cos(π/2+α)〕的值已知sinα是
已知sin α是方程5x²-7x-6=0的根,求〔sin(α+3/2π)sin(3/2π-α)*tan²(2π-α)〕/〔cos(π/2-α)cos(π/2 +α)〕的值
已知sin α是方程5x²-7x-6=0的根,求〔sin(α+3/2π)sin(3/2π-α)*tan²(2π-α)〕/〔cos(π/2-α)cos(π/2 +α)〕的值
已知sin α是方程5x²-7x-6=0的根,求〔sin(α+3/2π)sin(3/2π-α)*tan²(2π-α)〕/〔cos(π/2-α)cos(π/2 +α)〕的值