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If , 2 | y | , 5 x log 2 y cos 5 e 1 < ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ = ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − then :

1. x 2 y ′′ + xy ′ – 25y = 0
2. x 2 y ′′ – xy ′ – 25y = 0
3. x 2 y ′′ – xy ′ + 25y = 0
4. x 2 y ′′ + xy ′ + 25y = 0

Correct answer: x 2 y ′′ + xy ′ + 25y = 0

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