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Choose the One Alternative That Best Completes the Statement or Answers

Question 274

Multiple Choice

Choose the one alternative that best completes the statement or answers the question.
- cos2x+cosx1=0\cos ^ { 2 } x + \cos x - 1 = 0


A) 103.2,145.2,283.2,325.2103.2 ^ { \circ } , 145.2 ^ { \circ } , 283.2 ^ { \circ } , 325.2 ^ { \circ }
B) 49.8,130.2,229.8,310.249.8 ^ { \circ } , 130.2 ^ { \circ } , 229.8 ^ { \circ } , 310.2 ^ { \circ }
C) 51.8,308.251.8 ^ { \circ } , 308.2 ^ { \circ }
D) 70.5,109.5,180.070.5 ^ { \circ } , 109.5 ^ { \circ } , 180.0 ^ { \circ }

Correct Answer:

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