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Suppose θ ∈       π 4 , 0 is a solution of 4 cos θ – 3sin θ = 1. Then cos θ is equal to :

1. ) 2 – 6 3 ( 4
2. ) 2 – 6 3 ( 6 – 6
3. ) 2 6 3 ( 6 6 + +
4. ) 2 6 3 ( 4 +

Correct answer: ) 2 – 6 3 ( 4

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