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The value of $\cos^2 10° - \cos 10° \cos 50° + \cos^2 50°$ is:
(1) $\frac{3}{4} + \cos 20°$
(2) $3/4$
(3) $\frac{3}{4}(1 + \cos 20°)$
(4) $3/2$
After expanding and using product-to-sum identities, all cosine terms cancel leaving $\frac{3}{4}$.
BETA
