Use a sum or difference formula or a half angle formula to determine the value of the trigonometric functions. Give exact answers. Do not use decimal numbers. The answer should be a fraction or an arithmetic expression. If the answer involves a square root it should be enter as sqrt; e.g. the square root of 2 should be written as sqrt(2);
目前分類：【ｌｉｆｅ】 (105)
- Sep 26 Sat 2009 13:11
誠徵微積分高手XD
- Feb 10 Tue 2009 11:30
哇哈哈~ <img src="http://tinyurl.com/6xn34j" border="0"/>
- Feb 09 Mon 2009 23:45
原本今天可以去考駕照的&北京央視大火不是我幹的
- Feb 03 Tue 2009 19:59
我愛人要銬住我XDDD
- Feb 01 Sun 2009 22:00
終於可以打網咖通宵了XD
- Nov 27 Thu 2008 23:52
高三生活不是人阿＝3＝
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