1.

Let cos α + cos β = 2 and sin α + sin β = 0, where 0 ≤ α ≤ 90°, 0 ≤ β ≤ 90°. What is the value of cos 2α - cos 2β?

A. 0
B. 1
C. 2
D. Cannot be determined due to insufficient data
Answer» B. 1


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