I have recieved some great help with proving identities but I have a few more of these Trig Identities I'm having trouble with and I was wondering if anyone could help me prove them ??

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- May 2nd 2009, 09:27 PMGiggly2Identities
I have recieved some great help with proving identities but I have a few more of these Trig Identities I'm having trouble with and I was wondering if anyone could help me prove them ??

- May 3rd 2009, 12:28 AMrunning-gag

My advice :

1) learn and know perfectly the trig identities

2) practice a lot - May 3rd 2009, 02:05 AMMoo
Hello,

For the first one, another method :

Note that

So

Recall that

Hence

And finally,

- May 3rd 2009, 02:20 AMMoo