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二倍角的正弦、余弦、正切

二倍角的正弦、余弦、正切. 吴中区东山中学. 主讲 ： 蒋浩强. 如图 , 在⊙ O 中 , A B C 为圆周上的三个点 , 圆的半径为 r,. 或. 上面这些公式都叫做 倍角公式. 练习 :. 1. 利用倍角公式求下列各式的值 :. 3. 化简. 4. 求证. 思考题 :.

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二倍角的正弦、余弦、正切

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  1. 二倍角的正弦、余弦、正切 吴中区东山中学 主讲：蒋浩强

  2. 如图,在⊙O中, A B C为圆周上的三个点,圆的半径为r,

  3. 或 上面这些公式都叫做倍角公式.

  4. 练习: 1. 利用倍角公式求下列各式的值:

  5. 3.化简 4.求证

  6. 思考题:

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