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If θ is said to be an acute angle, and 4 cos2 θ - 1 = 0, then what is the value of tan (θ - 150)?

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If θ is said to be an acute angle, and 4 cos<sup>2</sup> θ - 1 = 0, then what is the value of tan (θ - 15<sup>0</sup>)?






 
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