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Which of the following differential equations is NOT exact? a. 2(_)3 dK + 4(2)3 dL = 0 b. (5y2 + 8x)dx + (10xy + 9y?

Which of the following differential equations is NOT exact? a. 2(_)3 dK + 4(2)3 dL = 0 b. (5y2 + 8x)dx + (10xy + 9y? )dy = 0 c. (2x - 5y - 7)dx + (8y - 5x + 4)dy = 0 d. (4x2y + 8xy3 ) dx + (3x3y - 5x2y?) dy = 0

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