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Let the solution curve y = y ( x ) of the differential equation y ) x 1 ( ) x ( tan x 3 dx dy 2 / 3 6 3 1 5    = 2x exp              6 3 1 3 x 1 x tan x pass through the origin. Then y

1. is equal to
2. exp           2 4 1
3. exp           2 4 4
4.           2 4 4 (4)           2 4 4

Correct answer: exp           2 4 1

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