化简 1.sin(α-2π)sin(α+π)-2cos(α-π/2)sin(α-π)-cos²(π/2+α)sin²(α-π/2)2.————————————cos(α-3π)sin(3π/2+α)第二个是 cos(α-3π)sin(3π/2+α)分之 sin²(α-π/2)
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![化简 1.sin(α-2π)sin(α+π)-2cos(α-π/2)sin(α-π)-cos²(π/2+α)sin²(α-π/2)2.————————————cos(α-3π)sin(3π/2+α)第二个是 cos(α-3π)sin(3π/2+α)分之 sin²(α-π/2)](/uploads/image/z/1816016-32-6.jpg?t=%E5%8C%96%E7%AE%80+1.sin%28%CE%B1-2%CF%80%29sin%28%CE%B1%2B%CF%80%29-2cos%28%CE%B1-%CF%80%2F2%29sin%28%CE%B1-%CF%80%29-cos%26%23178%3B%28%CF%80%2F2%2B%CE%B1%29sin%26%23178%3B%EF%BC%88%CE%B1-%CF%80%2F2%EF%BC%892.%E2%80%94%E2%80%94%E2%80%94%E2%80%94%E2%80%94%E2%80%94%E2%80%94%E2%80%94%E2%80%94%E2%80%94%E2%80%94%E2%80%94cos%EF%BC%88%CE%B1-3%CF%80%EF%BC%89sin%EF%BC%883%CF%80%2F2%2B%CE%B1%EF%BC%89%E7%AC%AC%E4%BA%8C%E4%B8%AA%E6%98%AF+cos%EF%BC%88%CE%B1-3%CF%80%EF%BC%89sin%EF%BC%883%CF%80%2F2%2B%CE%B1%EF%BC%89%E5%88%86%E4%B9%8B+sin%26%23178%3B%EF%BC%88%CE%B1-%CF%80%2F2%EF%BC%89)
化简 1.sin(α-2π)sin(α+π)-2cos(α-π/2)sin(α-π)-cos²(π/2+α)sin²(α-π/2)2.————————————cos(α-3π)sin(3π/2+α)第二个是 cos(α-3π)sin(3π/2+α)分之 sin²(α-π/2)
化简 1.sin(α-2π)sin(α+π)-2cos(α-π/2)sin(α-π)-cos²(π/2+α)
sin²(α-π/2)
2.————————————
cos(α-3π)sin(3π/2+α)
第二个是 cos(α-3π)sin(3π/2+α)分之 sin²(α-π/2)
化简 1.sin(α-2π)sin(α+π)-2cos(α-π/2)sin(α-π)-cos²(π/2+α)sin²(α-π/2)2.————————————cos(α-3π)sin(3π/2+α)第二个是 cos(α-3π)sin(3π/2+α)分之 sin²(α-π/2)
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