SOLUTION: Prove the identity: {{{sin(2x)/(2sin(x))=cos^2(x/2)

SOLUTION: Prove the identity: {{{sin(2x)/(2sin(x))=cos^2(x/2) - sin^2(x/2)}}}

Question 1129548: Prove the identity:
Answer by Edwin McCravy(20056) (Show Source): You can put this solution on YOUR website!



Use the identity: 
on the right side with  to rewrite the right
side as cos(x).



Now work with the left side.  [It's OK to do this, because you are
only working with one side AT A TIME, never BOTH sides together!!!]

Use the identity:  on the
left side:



Cancel:





Edwin

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