1-cosx= 2*sin^2(x/2)
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> 1-cosx= 2*sin^2(x/2)
1-cosx= 2*sin^2(x/2)
[From: ]
[author: ]
[Date: 11-10-08]
[Hit: ]
......
how?
-
cos(2A) = cos^2A-sin^2A
cos 2A= 1-2sin^2A
2sin^2A= 1-cos2A
If A=x/2 , then
2sin^2(x/2)= 1-cosx
1
keywords: sin,cosx,1-cosx= 2*sin^2(x/2)
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