1.

The value of cos2 10° – cos 10° cos 50°+ cos2 50° is:

A. \(\frac{3}{4} + {\rm{cos\;}}20^\circ\)
B. \(\frac{3}{4}\)
C. \(\frac{3}{2}\left( {1 + {\rm{cos\;}}20^\circ } \right)\)
D. \(\frac{3}{2}\)
Answer» C. \(\frac{3}{2}\left( {1 + {\rm{cos\;}}20^\circ } \right)\)


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