SOLUTION: 2cos^2(x/2)=(sin^2x)/(1-cosx)

Question 732417: 2cos^2(x/2)=(sin^2x)/(1-cosx)
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
Prove this identity:
2cos^2(x/2)=(sin^2x)/(1-cosx)
..
left side:
use cos half-angle formula:
2[√((1+cosx)/2)]^2=2((1+cosx)/2)=1+cosx
..
right side:(sin^2x)/(1-cosx)=(1-cos^2x)/(1-cosx)=
verified:
left side=right side=1+cosx
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