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图片：QQ截图20140722195741.jpg  来吧来吧，解法很多，有易有难。 个人拿到题之后想到了3种解法， 不知道大家能想到多少呢？ 欢迎回帖参与！ |
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沙发#
发布于：2014-07-29 21:48
WANGXIAOTIAN97：第一种：①sin2（90°－α）= cos2α我想到的是134，你厉害~ |
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板凳#
发布于：2014-07-29 21:52
又想到一种
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