Find all solutions of the equation in the interval [0, 2?).cos2 ? + 2 cos ? + 1 = 0

A. 2?
B. ?
C. ,
D. ,

Answer: B

Mathematics

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Find all critical points and find the minimum and maximum value of the function on the given domain.Domain: [-2, 3]

A. Critical points: - , - , , , ; maximum value: 3; minimum value: 1
B. Critical points: -2, -1, 0, 1, 2, 3; maximum value: 3; minimum value: 1
C. Critical points: -1, 0, 1, 2; maximum value: 3; minimum value: 1
D. Critical points: 1, 3; maximum value: -1, 1, 3; minimum value: -2, 0, 2