化简3sin(2π/3)cos(2π/3)
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化简3sin(2π/3)cos(2π/3)
![化简3sin(2π/3)cos(2π/3)](/uploads/image/z/17587023-15-3.jpg?t=%E5%8C%96%E7%AE%803sin%EF%BC%882%CF%80%2F3%EF%BC%89cos%EF%BC%882%CF%80%2F3%EF%BC%89)
3sin(2π/3)cos(2π/3)
=3/2sin(4π/3)
=3/2sin(4π/3-2π)
=-3/2sin2π/3
=-3√3/4
=3/2sin(4π/3)
=3/2sin(4π/3-2π)
=-3/2sin2π/3
=-3√3/4
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