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Write the sum of the order and degree of the differential equation (d2y/dx2 )2 + (dy/dx)3 + x4 = 0

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Given differential equation is (d2y/dx2 )2 + (dy/dx)+ x4 = 0 

Here, we see that the highest order derivative is d2y/dx2 , whose degree is 2.

Here,order = 2 and degree = 2

Sum of the order and degree = 2 + 2 = 4

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