已知角α终边过P(﹣4,3)求tanα/【sin(π-α)-cos(π/2+α)】中括号里面的在tanα的分母上第二问:若角β为第三象限角,且tanβ=4/3,求cos(2α-β)的值
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![已知角α终边过P(﹣4,3)求tanα/【sin(π-α)-cos(π/2+α)】中括号里面的在tanα的分母上第二问:若角β为第三象限角,且tanβ=4/3,求cos(2α-β)的值](/uploads/image/z/5345161-25-1.jpg?t=%E5%B7%B2%E7%9F%A5%E8%A7%92%CE%B1%E7%BB%88%E8%BE%B9%E8%BF%87P%28%EF%B9%A34%2C3%29%E6%B1%82tan%CE%B1%2F%E3%80%90sin%28%CF%80-%CE%B1%29-cos%28%CF%80%2F2%2B%CE%B1%29%E3%80%91%E4%B8%AD%E6%8B%AC%E5%8F%B7%E9%87%8C%E9%9D%A2%E7%9A%84%E5%9C%A8tan%CE%B1%E7%9A%84%E5%88%86%E6%AF%8D%E4%B8%8A%E7%AC%AC%E4%BA%8C%E9%97%AE%EF%BC%9A%E8%8B%A5%E8%A7%92%CE%B2%E4%B8%BA%E7%AC%AC%E4%B8%89%E8%B1%A1%E9%99%90%E8%A7%92%2C%E4%B8%94tan%CE%B2%3D4%2F3%2C%E6%B1%82cos%EF%BC%882%CE%B1-%CE%B2%EF%BC%89%E7%9A%84%E5%80%BC)
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