Posted by **Valerie** on Saturday, May 5, 2012 at 2:09am.

Can anyone please explain these problems to me?? I really need help!I need to simplify these trig expressions but I don't understand how my teacher is doing it at all and I have a quiz on this tomorrow! I've really been trying but I just don't get it!

1)Mulitply:

[cosx/(1-cosx)][1+sinx/(1+sinx)]

2)Rewrite over common denominator:

[1/(1-cosx)]+[1/(1+cosx)]

3)Establish the identity:

[(1-cot^2x)/(1+cot^2x)]+1=2sin^2x

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