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If a+pi/2lt2tan^(-1)x+3cot^(-1)xltb then...

If `a+pi/2lt2tan^(-1)x+3cot^(-1)xltb` then 'a'and 'b' are respectively.

A

1)`0 and 2pi`

B

2)`0 and pi`

C

3)`(-pi)/2 and 2pi`

D

4)`pi/2 and 2pi`

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The correct Answer is:
D
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