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Let f(x)=x^3+kx^2+5x+4sin^2x be an incr...

Let `f(x)=x^3+kx^2+5x+4sin^2x` be an increasing function on `x in R.` Then domain of k is

A

`(-sqrt2,sqrt2)`

B

`(-oo, sqrt3)`

C

`(sqrt3, oo)`

D

`(-sqrt3, sqrt3)`

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The correct Answer is:
D
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