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Posted by **Lavanda** on Wednesday, December 19, 2012 at 12:38pm.

sec^2 θ+sec θ=0

2 cos^2 θ+1=0

cot θ=cot^2 θ

sin^2 θ+5 sin θ=0

- Algebra -
**Damon**, Wednesday, December 19, 2012 at 1:52pm1/cos^2 + 1/cos = 0

1 + cos = 0

cos = -1

angle = 180 deg or pi radians

cos^2 = -1/2

impossible, square of real number is positive

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