三角函数二倍角三倍角半角公式推导

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Uploaded by on Jun 29, 2007

三角函数二倍角三倍角半角公式推导

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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

  • 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 !!!

  • 真的說的很不錯

    謝謝老師!

  • 很不错的说...

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