考研级数求和函数我问下这个级数不是应该是4sin(x/4)的展开式么?怎么会死4cos(x/4)这是为啥啊
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![考研级数求和函数我问下这个级数不是应该是4sin(x/4)的展开式么?怎么会死4cos(x/4)这是为啥啊](/uploads/image/z/12672812-20-2.jpg?t=%E8%80%83%E7%A0%94%E7%BA%A7%E6%95%B0%E6%B1%82%E5%92%8C%E5%87%BD%E6%95%B0%E6%88%91%E9%97%AE%E4%B8%8B%E8%BF%99%E4%B8%AA%E7%BA%A7%E6%95%B0%E4%B8%8D%E6%98%AF%E5%BA%94%E8%AF%A5%E6%98%AF4sin%28x%2F4%29%E7%9A%84%E5%B1%95%E5%BC%80%E5%BC%8F%E4%B9%88%3F%E6%80%8E%E4%B9%88%E4%BC%9A%E6%AD%BB4cos%28x%2F4%29%E8%BF%99%E6%98%AF%E4%B8%BA%E5%95%A5%E5%95%8A)
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