Differential EquationHard

Question

If f(x), g(x), h(x) are polynomials of three degree, then
   φ(x) =
is a polynomial of degree (where fn(x) represents nth derivative of f(x))-

Options

A.3
B.2
C.6
D.0

Solution

φ′(x) = 0
∴   φ(x) is constant

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