If sinx+xge|k|x^(2), AA x in [0,(pi)/(2)...

If `sinx+xge|k|x^(2), AA x in [0,(pi)/(2)]`, then the greatest value of k is

A

`(-2(2+pi))/(pi^(2))`

B

`(2(2+pi))/(pi^(2))`

C

can't be determined finitely

D

zeero

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