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Mathematics 21 Online
OpenStudy (anonymous):

Help w/ a trigonometric problem?

OpenStudy (anonymous):

Sure!

OpenStudy (anonymous):

\[\frac{ 1 - 3 \sin \theta }{ 1 - \sin \theta } = \frac{ 1 - 2\sin \theta - 3\sin ^2\theta }{ \cos^2\theta } \] Thanks!

OpenStudy (anonymous):

Give me a second.

OpenStudy (anonymous):

Uh, are you supposed to solve for something or just see if the results are equal?

OpenStudy (anonymous):

You're supposed to verify, so choose a side and get it equal to the other,

OpenStudy (anonymous):

I'm not really sure how to do this. @Agl202

OpenStudy (johnweldon1993):

I do not believe these 2 sides are equal, I've tried a few things and can not find a way to verify

OpenStudy (anonymous):

\[ \frac{1-2\sin(\theta)-3\sin^2(\theta)}{\cos^2(\theta)} \] \[= \frac{1-3\sin(\theta) + \sin(\theta) - 3\sin^2(\theta)}{1-\sin^2(\theta)}\] \[= \frac{[1-3\sin(\theta)]\cdot[1+\sin(\theta)]}{[1-\sin(\theta)]\cdot[1+\sin(\theta)]}\] \[= \frac{1-3\sin(\theta)}{1-\sin(\theta)}\]

OpenStudy (anonymous):

Thank you so much, I actually understand that!

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