三角函数二倍角三倍角半角公式推导
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Added: 4 years ago
From: PengTitus
Views: 5,033
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  • 哈哈，三角函数的推导学习完毕，再巩固一下今后就不会忘掉

    wdy760408 3 years ago

  • 谢谢！通过这个演算我可以更好地记住所谓的万能公式了，也就是用­tanx来表示sin2x和cos2x的那两个公式，而且即使不­记得结果也能自己推了，many thanx !!!

    JessieAddick 3 years ago

  • 真的說的很不錯

    謝謝老師!

    tommy921092 3 years ago

  • 很不错的说...

    jasonluo1990 3 years ago

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