# Urgent Help With Trig Proofs

• Jun 24th 2008, 08:04 PM
rabidsquirrel
Urgent Help With Trig Proofs
(Sinθ - 1)/(1-sin2θ) = (cscθ)/(-cscθ-1)

or

(1-sinθ)/(1+sinθ) = (tanθ-secθ)^2
• Jun 24th 2008, 09:33 PM
TKHunny
1) Please write what you mean. You have written $\displaystyle \sin(2\theta)$. I am guessing this is not your intent.

2) Are you acquainted with the Pythagorean Identity? $\displaystyle \cos^{2}(x) + \sin^{2}(x) = 1$?

3) $\displaystyle \csc(\theta) = 1/\sin(\theta)$
• Jun 24th 2008, 09:35 PM
rabidsquirrel
i intended it to read sin^2 theta
• Jun 24th 2008, 09:40 PM
kalagota
Quote:

Originally Posted by rabidsquirrel
(Sinθ - 1)/(1-sin2θ) = (cscθ)/(-cscθ-1)

$\displaystyle \frac{\csc x}{-\csc x - 1} = - \frac{1}{1+\sin x}$

you should know what to multiply then...
• Jun 24th 2008, 09:43 PM
rabidsquirrel
Quote:

Originally Posted by kalagota
$\displaystyle \frac{\csc x}{-\csc x - 1} = - \frac{1}{1+\sin x}$

you should know what to multiply then...

you cannot multiply across, it is a proof
• Jun 24th 2008, 09:44 PM
rabidsquirrel
Quote:

Originally Posted by kalagota
$\displaystyle \frac{\csc x}{-\csc x - 1} = - \frac{1}{1+\sin x}$

you should know what to multiply then...

• Jun 25th 2008, 01:05 AM
kalagota
Quote:

Originally Posted by rabidsquirrel