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Let AB and PQ be two vertical poles, 160 m apart from each other. Let C be the middle point of B and Q, which are feet of these two poles. Let 8 π and θ be the angles of elevation from C to P and A, respectively. If the height of pole PQ is twice the height of pole AB , then tan 2 θ is equal to

1. 2 2 2 3 −
2. 2 2 3 +
3. 4 2 2 3 −
4. 4 2 3 −

Correct answer: 4 2 2 3 −

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