解一道二倍角公式题已知函数f(x)=根号2(sinx-cosx).求若(a,5分之6)在函数f(x)的图像上,45°.3楼的..我计出的是 2sin(x-45°)..为什么会不一样呢?我的算法是:=根号2sinx-根号2cosx根号2的平方+根
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![解一道二倍角公式题已知函数f(x)=根号2(sinx-cosx).求若(a,5分之6)在函数f(x)的图像上,45°.3楼的..我计出的是 2sin(x-45°)..为什么会不一样呢?我的算法是:=根号2sinx-根号2cosx根号2的平方+根](/uploads/image/z/1207566-54-6.jpg?t=%E8%A7%A3%E4%B8%80%E9%81%93%E4%BA%8C%E5%80%8D%E8%A7%92%E5%85%AC%E5%BC%8F%E9%A2%98%E5%B7%B2%E7%9F%A5%E5%87%BD%E6%95%B0f%28x%29%3D%E6%A0%B9%E5%8F%B72%EF%BC%88sinx-cosx%EF%BC%89.%E6%B1%82%E8%8B%A5%EF%BC%88a%2C5%E5%88%86%E4%B9%8B6%EF%BC%89%E5%9C%A8%E5%87%BD%E6%95%B0f%28x%29%E7%9A%84%E5%9B%BE%E5%83%8F%E4%B8%8A%2C45%C2%B0.3%E6%A5%BC%E7%9A%84..%E6%88%91%E8%AE%A1%E5%87%BA%E7%9A%84%E6%98%AF+2sin%28x-45%C2%B0%EF%BC%89..%E4%B8%BA%E4%BB%80%E4%B9%88%E4%BC%9A%E4%B8%8D%E4%B8%80%E6%A0%B7%E5%91%A2%EF%BC%9F%E6%88%91%E7%9A%84%E7%AE%97%E6%B3%95%E6%98%AF%EF%BC%9A%3D%E6%A0%B9%E5%8F%B72sinx-%E6%A0%B9%E5%8F%B72cosx%E6%A0%B9%E5%8F%B72%E7%9A%84%E5%B9%B3%E6%96%B9%2B%E6%A0%B9)
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