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If ) x tan x (sec tan y 3 3 1 − = − , 2 3 x 2 3 π < < π , then

1. xy ' + 2y ' = 0
2. 2 3 y 6 – ' y x 2 π +
3. 0 3 y 6 – ' y x 2 = π +
4. xy ' – 4y ' = 0

Correct answer: 2 3 y 6 – ' y x 2 π +

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