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§4.5 正、余弦的诱导公式 （二）

§4.5 正、余弦的诱导公式 （二）. 我们的目标 熟练掌握诱导公式，学会灵活运用. y. 0. x. 一字师. 口诀：奇变偶不变，符号看象限. 意义：. 典型例题.

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§4.5 正、余弦的诱导公式 （二）

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  1. §4.5 正、余弦的诱导公式 （二） • 我们的目标 • 熟练掌握诱导公式，学会灵活运用

  2. y 0 x 一字师 口诀：奇变偶不变，符号看象限 意义：

  3. 典型例题

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