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Let for ƒ(x) = 7tan 8 x + 7tan 6 x – 3tan 4 x – 3tan 2 x, I 1 = ∫ π 4 / 0 dx ) x ( f and I 2 = ∫ π 4 / 0 dx ) x ( xf . Then 7I 1 + 12I 2 is equal to :

1. 2 π
2. π
3. 1
4. 2

Correct answer: 1

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