There is a real root, 0°<<180° for (3sin) 2- (4cos )+2=0, find the range of .
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(a) (π/6) × (180°/π) = 30°
(b) 2π × (180°/π) = 360°
(c) 1 × (180°/π) = (180/π)° ≈ 57.3°
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