# Math Help - trig identity verifying need help

1. ## trig identity verifying need help

cscx=(cot(x/2))/(1-cosx)

2. ## Re: trig identity verifying need help

Hey thegurn.

Hint: What are the identities for tan(x/2) in terms of sine and cosine?

3. ## Re: trig identity verifying need help

The best way to start is to write all the identities of sin and cosin, simplify, and then consider what identities you might need.

4. ## Re: trig identity verifying need help

Originally Posted by thegurn
cscx=(cot(x/2))/(1-cosx)
Check the problem. There must be some misprint.

5. ## Re: trig identity verifying need help

so there's no way to solve it as is?

6. ## Re: trig identity verifying need help

The identity is true when the problem is
cscx = cot(x/2)/(1+cosx)

7. ## Re: trig identity verifying need help

The identity is cscx = ( cot (x/2))/(1+cosx) = ( cos (x/2)/ sin ( x/2))/ [2 cos^2 ( x/2) ] [ Because cos 2a = 2cos^2A-1]
Which on simplification gives cscx