1.

When 0° ≤ θ ≤ 90°, then solution of cos2 θ + sin θ - 2 = 0 is

A. θ = 30°
B. θ = 60° or 45°
C. θ = 45° or 90°
D. θ = 60° or 90°
Answer» B. θ = 60° or 45°


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