cos²(x+π/4)-sin²(x+π/4)= cos[2(x+π/4)]= cos(2x+π/2)= - sin(2x)用到了倍角公式cos(2x) = cos² x - sin² x以及诱导公式cos(a+π/2) = - sin a
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买包网 2021-11-22 00:19 编辑：admin 178阅读
cos²(x+π/4)-sin²(x+π/4)= cos[2(x+π/4)]= cos(2x+π/2)= - sin(2x)用到了倍角公式cos(2x) = cos² x - sin² x以及诱导公式cos(a+π/2) = - sin a
zdxfcygvuhijouytdrsestdutiyo.kjhgfbvsdzdtytgdzxftiythfgxfitfkfngdxfkutxfgftigyffhcfgiul'
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