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f(x)=x^3+kx^2+5x+4sin^2x be an increasing function on x€R then domain of k is: A.(-√2,√2) B.(-infinity,√3) C.(√3,infinity) D.(-√3,√3)

f(x)=x^3+kx^2+5x+4sin^2x be an increasing function on x€R then domain of k is:
A.(-√2,√2)
B.(-infinity,√3)
C.(√3,infinity)
D.(-√3,√3)

Grade:10

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