Stuck on all of these and can't see to get my answers anywhere close to the answers

a) Express in terms of

b) Prove the identity

and finally

c) Given that show that

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- February 25th 2009, 01:51 AMBeard[SOLVED] Double angle identities
Stuck on all of these and can't see to get my answers anywhere close to the answers

a) Express in terms of

b) Prove the identity

and finally

c) Given that show that - February 25th 2009, 02:36 AMADARSH
- February 25th 2009, 02:50 AMADARSH
Using the formula

http://www.mathhelpforum.com/math-he...ca515035-1.gif

http://www.mathhelpforum.com/math-he...c1b4fa9f-1.gif

We will get

numerator =

Now we use

So numerator

Similarly Denominator will become

So our term is now

Now cancel the terms common in numerator and denominator

And that's the end of the Second Show(Party)(Dance) - February 25th 2009, 03:05 AMADARSH