三角恒等公式的推导sin方a+sin方(a+2/3п)+sin方(a-2/3п)=3/2及sin立方a+sin立方(a+2/3п)+sin立方(a-2/3п)=-3/4sin3a
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![三角恒等公式的推导sin方a+sin方(a+2/3п)+sin方(a-2/3п)=3/2及sin立方a+sin立方(a+2/3п)+sin立方(a-2/3п)=-3/4sin3a](/uploads/image/z/8843602-58-2.jpg?t=%E4%B8%89%E8%A7%92%E6%81%92%E7%AD%89%E5%85%AC%E5%BC%8F%E7%9A%84%E6%8E%A8%E5%AF%BCsin%E6%96%B9a%2Bsin%E6%96%B9%28a%2B2%2F3%D0%BF%29%2Bsin%E6%96%B9%28a-2%2F3%D0%BF%29%3D3%2F2%E5%8F%8Asin%E7%AB%8B%E6%96%B9a%2Bsin%E7%AB%8B%E6%96%B9%28a%2B2%2F3%D0%BF%29%2Bsin%E7%AB%8B%E6%96%B9%28a-2%2F3%D0%BF%29%3D-3%2F4sin3a)
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