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二倍角的正弦、余弦、正切

二倍角的正弦、余弦、正切. (2). 复习回顾. 二倍角公式. ① 推导方法. 注意: T 2α 公式成立的条件:. ② 正切公式的条件. ③ 公式的特征. ④ 公式的变形. 引申:公式变形:. 升幂降角公式. 降幂升角公式. 例 1 :求值. 练习:. 方法 1 :运用二倍角公式变形式, 先降次再结合正弦和(差)角公 式求解;. 分析. 方法 2 :运用正弦和(差)角公式。. 和差化积公式.

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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 (2)

  2. 复习回顾 二倍角公式 ①推导方法 注意: T2α公式成立的条件: ②正切公式的条件 ③公式的特征 ④公式的变形

  3. 引申:公式变形: 升幂降角公式 降幂升角公式

  4. 例1:求值

  5. 练习:

  6. 方法1:运用二倍角公式变形式, 先降次再结合正弦和(差)角公 式求解; 分析 方法2:运用正弦和(差)角公式。

  7. 和差化积公式

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