Posted by **Natalie** on Sunday, April 7, 2013 at 1:42pm.

What value(s) of theta (0 less than or equal to theta less than or equal to 2pi) solve the following equation: cos squared theta - cos theta - 6 = 0

- Precalc with Trig -
**Reiny**, Sunday, April 7, 2013 at 3:49pm
cos^2 Ø - sin^2 Ø = 6

cos 2Ø = 6

no solution, the cosine of anything cannot be greater than 1

do you have a typo?

- Precalc with Trig -
**Natalie**, Sunday, April 7, 2013 at 5:23pm
No, I don't just my professor trying to trick us, thanks for the help!

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