Trig trick (Posted on 2002-11-07)

	Submitted by Dulanjana
Rating: 2.4545 (11 votes)
Solution:	(Hide)
If you take the right angled triangle ABC (Where b is a right angle and C = x) then sin^2 x = AB^2/AC^2 cos^2 x = BC^2/AC^2 Therefore sin^2 x + cos^2 = (AB^2 + BC^2)/AC^2 But AB^2 + BC^2 = AC^2 (Pythogorean Thoerem) Through substituition AC^2/AC^2 = 1 So sin^2 x + cos^2 = 1

	Subject	Author	Date
	By definition	Jer	2012-12-21 17:45:47
	Solution	K Sengupta	2007-05-28 12:06:41
	re:	Rebecca Jaffe	2005-08-30 08:16:51
	what is.....	Billy Bob	2004-03-28 10:53:05
	re(2): duh	Gamer	2003-10-10 19:41:57
	re: duh	SilverKnight	2003-10-09 21:17:38
	duh	Drew	2003-10-09 20:12:44
	re(2): Solution	nikki	2003-07-17 12:17:37
	Solution	Chaz	2003-05-03 02:53:36
	re: Solution	seraphya berrin	2002-11-23 14:07:50
	re: James	Dulanjana	2002-11-09 22:42:20
	No Subject	James	2002-11-09 05:45:19
	Solution	Happy	2002-11-08 12:17:08