Troubling Trigono
Geometry
Level
3
Given that
\[ \sin \theta + \sin^2 \theta + \sin^3 \theta = 1, \]
find the value of
\[ \cos^6 \theta - 4 \cos^4 \theta + 8 \cos ^2 \theta \]
Please share your solution. I am really confused about this problem.
by
Louis Fernandez