Albert
Posts:
282
Registered:
12/9/07


Proving trigonometric identities
Posted:
Jan 20, 2009 2:19 AM


Hey everybody!!! how do you prove that:
cos(x) / [1  sin(x)] = [1 + sin(x)] / cos(x) ?
Currently, I don't think cosec(theta) = 1 / sin(theta), sec(theta) = 1 / cos(theta) are necessary in this proof. I've fiddled around with sec(theta) = 1 / cos(theta) and cot(theta) = 1 / tan(theta) but I can't get it turn in2 the right hand side. I've had two complete proofs and I've done one proof all by myself but they all involved the square relations and now the fourth and final problem in the minisection gives me an equation without the squares : ( (and I don't know what 2do).
Could sum1 plz give me a suggestion?
TIA Albert

