Trigonometry help ! !

  • Thread starter draotic
  • Start date
  • #1
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Homework Statement


will sum1 prove this ........@=theta
1-cos@ / sin@ = tan(@/2)


Homework Equations





The Attempt at a Solution


i tried to do this
cos@ = cos^2(@/2) - sin^2 (@/2)
wat now?
...
thats doesnt get me anywhere
 
Last edited:

Answers and Replies

  • #2
Mentallic
Homework Helper
3,798
94
Since you have a half angle on the right side, you'll want to convert all angles into their half angle equivalents. For example, [tex]\sin(2x)=2\sin(x)\cos(x)[/tex] therefore [tex]\sin(\theta)=2\sin\left(\frac{\theta}{2}\right) \cos \left(\frac{\theta}{2}\right)[/tex]
 

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