What is the solution of (x² + 2xy - 4y²)dx - (x² − 8xy – 4y²)dy =0 ? - - a. x² - 4y² = c(x-y) b. x² + 2y² = c(x+2y) c. x² + 2y² = c(x-2y) d. x² + 4y² = c(x+y)

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