用诱导公式求这个简单的三角函数值.(急!)
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用诱导公式求这个简单的三角函数值.(急!)
sin(-26π/3)
sin(-26π/3)
![用诱导公式求这个简单的三角函数值.(急!)](/uploads/image/z/19823420-20-0.jpg?t=%E7%94%A8%E8%AF%B1%E5%AF%BC%E5%85%AC%E5%BC%8F%E6%B1%82%E8%BF%99%E4%B8%AA%E7%AE%80%E5%8D%95%E7%9A%84%E4%B8%89%E8%A7%92%E5%87%BD%E6%95%B0%E5%80%BC.%EF%BC%88%E6%80%A5%21%EF%BC%89)
sin(-26π/3)
=sin(-26π/3+5*2π)
=sin(4π/3)
=sin(π+π/3)
=-sinπ/3
=-√3/2
=sin(-26π/3+5*2π)
=sin(4π/3)
=sin(π+π/3)
=-sinπ/3
=-√3/2